My name is Gerald. I am fifty-six years old and I have been a high school principal for fourteen years. Before that, I spent nine years in the classroom teaching history. I have been standing at the front of rooms, commanding attention, and maintaining professional composure under pressure for my entire adult career. What happened during the district school board presentation eighteen months ago was the first time in twenty-three years of education that my body overruled my professional judgment in front of an audience.
I was presenting the school’s five-year technology integration plan to the district superintendent and four board members. Twelve minutes into a thirty-minute presentation, I had to excuse myself. The urgency came on without warning, and after three years of progressing urinary frequency, I had lost the ability to defer it. I asked the superintendent to hold for a moment, walked across the conference room, and left. I returned four minutes later and completed the presentation. Nobody said anything. The superintendent is a professional. But I watched him check his watch when I returned, and the silence in the room for the next three minutes told me everything I needed to know about how that moment had been received.
I had been managing a quietly worsening prostate health situation for three years without taking it seriously enough to treat it properly. Basic saw palmetto for five months. A prostate supplement from the pharmacy that combined zinc and pumpkin seed but produced only modest improvement. My GP had mentioned pharmaceutical options, which I had been deferring. When I came across research suggesting that hard water mineral accumulation in the prostate — calcium and magnesium mineral deposits from years of tap water consumption — was a contributing factor to urinary constriction that conventional botanical supplements did not address, and found ViriFlow specifically formulated around marine mineral compounds to flush those deposits, I decided to run a structured 90-day trial. Here is the complete account.
My Starting Point — The Baseline Numbers
| Metric | Day 1 Baseline |
| Nighttime Bathroom Trips | 2–3 per night |
| Daytime Urgency Episodes | 5–7 notable urgency episodes daily |
| Urinary Flow Strength (1–10) | 3/10 — weak, hesitant start |
| Bladder Emptying (1–10) | 3/10 — constant incomplete feeling |
| Sleep Quality (1–10) | 3/10 |
| Professional Confidence (1–10) | 4/10 — calculating access constantly |
| Overall Urinary Comfort (1–10) | 3/10 |
What Is ViriFlow?
ViriFlow is a plant-based prostate and urinary health supplement in capsule form built around a distinctive dual-mechanism approach. Most prostate supplements focus exclusively on DHT hormonal balance and prostate tissue inflammation. ViriFlow adds a third mechanism that distinguishes it: marine mineral compounds designed to dissolve and flush the hard-water calcium and magnesium mineral deposits that can accumulate in prostate tissue over years of mineral-heavy water consumption, potentially narrowing the urethral passage beyond what hormonal or anti-inflammatory interventions alone can address.
IMPORTANT: ViriFlow is a dietary supplement, not a medical treatment for diagnosed benign prostatic hyperplasia, prostate cancer, or any clinical urological condition. Men with significant, sudden, or painful urinary symptoms should be evaluated by a physician or urologist before any supplementation. ViriFlow is appropriate for adult men over 40 seeking proactive, natural support for age-related urinary changes alongside professional medical oversight.
The formula contains ten natural ingredients: Nori Yaki Extract, Wakame Extract, Kelp Powder, Bladderwrack Powder, Saw Palmetto Berry, Pomegranate Extract, Shilajit, Neem Leaf Extract, Pygeum Africanum Bark Extract, and Iodine. Two capsules taken twice daily with water. Non-GMO, vegan, gluten-free, stimulant-free, manufactured in an FDA-registered, GMP-certified US facility. 60-day money-back guarantee.
The Science: How ViriFlow Actually Works
1. Hard Water Mineral Dissolution — The Marine Mineral Mechanism
The most clinically differentiated aspect of ViriFlow is its targeting of mineral deposit accumulation in prostate tissue. Hard water — the standard tap water in the majority of US cities — contains dissolved calcium and magnesium minerals that are consumed daily over decades. Research has suggested that these minerals can accumulate in prostate tissue and contribute to the physical constriction of the urethral passage independently of prostate size changes driven by DHT. ViriFlow’s four marine botanical ingredients — Nori Yaki, Wakame, Kelp, and Bladderwrack — provide fucoidan compounds, alginates, and iodine-rich mineral complexes traditionally used in Japanese medicine for their mineral-chelating and urinary tract cleansing properties, specifically targeting the hard-water deposits that other prostate formulas never address.
2. DHT Regulation and Prostate Tissue Health
Saw Palmetto and Pygeum Africanum address the hormonal and tissue-level dimension of prostate health. Saw Palmetto’s fatty acid and phytosterol content inhibits 5-alpha reductase — the enzyme converting testosterone to DHT — reducing the hormonal stimulation of prostate cell growth. Pygeum Africanum’s clinical evidence base, established through multiple randomized controlled trials and summarized in a Cochrane systematic review, specifically documents reductions in nocturia, improved urinary flow rates, and decreased residual bladder volume.
3. Anti-Inflammatory and Antioxidant Cellular Protection
Pomegranate Extract provides ellagic acid and punicalagins — among the most potent natural antioxidants studied in prostate health research — reducing the oxidative stress and inflammatory signalling that drive both acute prostate irritation and progressive tissue changes. Neem Leaf Extract adds significant anti-inflammatory, antimicrobial, and purifying activity at the urinary tract level, addressing the microenvironmental inflammation that contributes to bladder overactivity and urgency. Together these ingredients create a comprehensive anti-inflammatory environment throughout the prostate and bladder.
4. Testosterone Support and Systemic Vitality
Shilajit — a fulvic acid-rich mineral resin from Himalayan rock formations — has been studied in multiple clinical trials for its effects on testosterone levels, mitochondrial energy production, and overall male vitality. Research published in Andrologia documented significant improvements in total and free testosterone levels in infertile men receiving standardized Shilajit versus placebo. Iodine from the marine ingredients supports thyroid function, which governs metabolic rate, energy production, and the hormonal environment that affects prostate health indirectly through systemic metabolic regulation.
Ingredient-by-Ingredient Clinical Breakdown
Nori Yaki, Wakame, Kelp, Bladderwrack (Marine Mineral Complex)
The mineral cleansing complex that uniquely differentiates ViriFlow from conventional prostate supplements. These four Japanese sea vegetables share a high concentration of fucoidan — a sulphated polysaccharide with documented anti-inflammatory, antioxidant, and urinary tract protective properties. Their iodine and alginate content provides the mineral-chelating activity central to ViriFlow’s hard-water deposit flushing mechanism. Traditional Japanese diets featuring these sea vegetables are associated with substantially lower rates of prostate problems, a dietary epidemiological observation that motivated the formula’s marine-first ingredient design.
Saw Palmetto Berry
The most widely researched botanical ingredient for benign prostate-related urinary symptoms. Saw Palmetto’s free fatty acid and phytosterol content inhibits both isoforms of 5-alpha reductase, reducing DHT accumulation in prostate tissue. While meta-analyses of clinical trial evidence show variable efficacy for saw palmetto alone, its inclusion in a multi-ingredient formula alongside Pygeum and the marine mineral complex addresses a more comprehensive range of mechanisms than any single ingredient could reach independently.
Pygeum Africanum
The most thoroughly evidence-supported botanical for functional urinary improvement in men with prostate-related symptoms. A Cochrane systematic review of 18 randomized controlled trials documented that men receiving Pygeum Africanum extract experienced significantly greater improvements in peak urinary flow rate and residual bladder volume compared to placebo. Its mechanisms include anti-inflammatory activity in prostate tissue, inhibition of prostate-stimulating growth factors, and modulation of bladder detrusor muscle tone — addressing multiple dimensions of urinary dysfunction simultaneously.
Pomegranate Extract
The antioxidant powerhouse with specific documented relevance to prostate cellular health. Pomegranate’s ellagic acid and punicalagins are metabolized to urolithins — compounds that accumulate specifically in prostate tissue and exert anti-inflammatory and mild anti-androgenic effects. Research published in Clinical Cancer Research has examined pomegranate juice’s effects on PSA doubling time in prostate cancer patients, demonstrating biological activity at the prostate tissue level. Its antioxidant protection of prostate cells from oxidative damage addresses the long-term cellular dimension of prostate health that botanical DHT inhibitors alone cannot provide.
Shilajit (Fulvic Acid Complex)
The ancient mineral resin with the strongest evidence base for testosterone support in the formula. Shilajit’s primary active compound — fulvic acid — functions as a cellular electron transporter that enhances mitochondrial energy production and nutrient delivery across cell membranes. Its documented effects on testosterone levels in clinical research distinguish it from general adaptogens. Research published in Andrologia demonstrated 23.5% improvement in total testosterone in men receiving standardized shilajit, with corresponding improvements in sperm quality and male vitality markers — making it the formula’s primary testosterone support ingredient.
Neem Leaf Extract and Iodine
The antimicrobial purifier and thyroid-metabolic support completing the formula’s comprehensive coverage. Neem leaf’s azadirachtin and nimbidin compounds provide powerful anti-inflammatory, antimicrobial, and immunomodulatory activity relevant to urinary tract health. Its traditional use in Ayurvedic medicine for urinary complaints spans centuries, supported by modern research on its anti-inflammatory mechanisms. Iodine from the marine ingredients supports thyroid function, whose role in metabolic regulation affects the entire hormonal environment in which prostate health operates — a systemic benefit that conventional prostate supplements entirely overlook.
Why I Finally Tried ViriFlow
Walking out of my own school board presentation was the threshold I could not rationalize past. A principal who cannot maintain composure for thirty minutes of his own scheduled presentation has a professional problem that requires a professional response. When I researched the hard-water mineral mechanism and recognized that I had lived in a hard-water city for eighteen years, consuming that mineral load daily, the scientific logic of a marine-mineral approach to prostate health made sense in a way that my previous basic saw palmetto and zinc supplements had never addressed. The 60-day guarantee reduced the financial risk to a manageable level. I committed to 90 days with the same professionalism I would apply to any institutional initiative.
My Exact Protocol: Diet, Exercise & Dosage
- Supplement: Two capsules twice daily — morning with breakfast and evening with dinner. Zero missed doses across 90 days.
- Water: Switched to filtered water for daily drinking — reducing ongoing mineral intake during the trial period.
- Diet: Increased tomato consumption (lycopene for prostate health), reduced alcohol to weekends only.
- Evening fluids: Stopped all fluid intake after 7:30 p.m. — behavioural change made alongside supplementation.
The 90-Day Timeline With Real Measurements
Weeks 1–3: Early Comfort Changes
By day ten, the daytime urgency episodes had reduced from five to seven to three to four. Not eliminated, but the emergency quality — the instant compelling urgency — had shifted toward a more manageable awareness with a wider response window. Nighttime trips remained at two per night. Flow strength was unchanged. I interpreted the early changes as the anti-inflammatory and bladder-calming effects of Neem and Pygeum beginning to reduce bladder overactivity before the marine mineral mechanisms had time to produce structural change.
| Metric | Day 1 | Week 3 | Change |
| Nighttime Trips | 2–3 | 2 | Slight |
| Daytime Urgency | 5–7 daily | 3–4 daily | Noticeable improvement |
| Flow Strength (1–10) | 3/10 | 3.5/10 | Marginal |
| Bladder Emptying (1–10) | 3/10 | 3.5/10 | Marginal |
| Sleep Quality (1–10) | 3/10 | 4/10 | Early improvement |
Weeks 4–6: The Structural Shift
By week five — which would be consistent with the timeline for marine mineral compounds to work through the flushing mechanism — a clear change in flow strength had emerged. The hesitant, stop-start initiation that had characterised my urinary experience for two years was noticeably improved. The stream itself was stronger and more consistent. The incomplete emptying sensation that had followed every void was occurring less frequently. Daytime urgency had reduced to one to two episodes, and their character had changed from emergency to inconvenience. One full night of uninterrupted sleep in week five was the first I had experienced in over a year.
| Metric | Day 1 | Week 6 | Change |
| Nighttime Trips | 2–3 | 1 (most nights) | Major improvement |
| Daytime Urgency | 5–7 daily | 1–2 daily | Dramatic reduction |
| Flow Strength (1–10) | 3/10 | 6.5/10 | Strong improvement |
| Bladder Emptying (1–10) | 3/10 | 7/10 | Meaningful |
| Professional Confidence (1–10) | 4/10 | 7.5/10 | Significant |
Weeks 7–13: Professional Restoration
By day 90, I was managing my professional schedule without any urinary-related calculation or contingency planning. The board presentation scenario that had started this trial would not repeat itself with the urinary function I had by week twelve. At my annual physical, my GP reviewed the formula, noted the Pygeum evidence base approvingly, and confirmed that my self-reported improvements were clinically consistent with what those ingredients were capable of producing.
FINAL MEASUREMENTS — DAY 90: Nighttime Trips: 2–3 → 0–1. Daytime Urgency: 5–7 → 0–1. Flow Strength: 3/10 → 8/10. Bladder Emptying: 3/10 → 8/10. Sleep Quality: 3/10 → 8/10. Professional Confidence: 4/10 → 9/10. Overall Urinary Comfort: 3/10 → 8.5/10. GP confirmed ingredient evidence base consistent with reported outcomes.
| Metric | Day 1 | Day 90 | Total Change |
| Nighttime Bathroom Trips | 2–3 | 0–1 | Major improvement |
| Daytime Urgency Episodes | 5–7 daily | 0–1 daily | Dramatic reduction |
| Urinary Flow Strength | 3/10 | 8/10 | +5 points |
| Bladder Emptying Completeness | 3/10 | 8/10 | +5 points |
| Sleep Quality | 3/10 | 8/10 | +5 points |
| Professional Confidence | 4/10 | 9/10 | +5 points |
| Overall Urinary Comfort | 3/10 | 8.5/10 | +5.5 points |
Real-World Wins (And What Did Not Change)
The Real-World Wins
I have presented to the school board twice since completing the trial. I did not excuse myself. I did not calculate bathroom access. I completed both presentations as I had for the first fourteen years of my career — with full professional presence and no peripheral management of a health problem competing for my attention. The sleep restoration has been the compounding quality-of-life change: from three disrupted nights weekly to sleeping through on most nights has produced the cognitive clarity that fourteen years of administrative decision-making requires.
What Did Not Change
ViriFlow did not produce pharmaceutical-level speed. The most meaningful improvements emerged between weeks four and eight — the marine mineral flushing mechanism requires time to work. Flow strength at 8/10 is dramatically better than 3/10 but is not the flow of a thirty-year-old. I maintain the evening fluid restriction behavioural change I implemented alongside the supplement — I cannot claim the supplement alone produced all results.
Honest Pros and Cons
| Pros | Cons |
| Marine Mineral Mechanism: Uniquely targets hard-water mineral deposits in prostate tissue — a dimension of prostate health that conventional botanical supplements never address. | Four Capsules Daily: Two capsules twice daily requires consistent twice-daily dosing discipline. |
| Ten-Ingredient Comprehensive Formula: Addresses mineral deposits, DHT hormonal balance, inflammation, antioxidant protection, and testosterone support simultaneously. | Requires Patience: Marine mineral flushing effects take 4–6 weeks to produce meaningful structural improvement. |
| Pygeum Clinical Evidence Base: One of the most Cochrane-reviewed botanicals in urology — not marketing claims. | Online Only: Not available in pharmacies or retail supplement stores. |
| GP Confirmed Consistency: Physician reviewed formula and confirmed ingredient evidence base is clinically consistent with reported outcomes. | 60-Day Guarantee: Adequate but requires timely use of the guarantee window given the 90-day optimal trial timeline. |
| Shilajit Testosterone Support: Adds a male vitality dimension that prostate-only formulas lack. | Premium Price: Four-capsule daily protocol means faster consumption — multi-bottle purchases necessary. |
Side Effects and Safety
Zero adverse effects across the full 90-day trial. No digestive disruption from the four-capsule daily protocol. No changes in heart rate, blood pressure, or any other monitored parameter. No allergic responses to the marine botanical ingredients.
SAFETY NOTE: Men with shellfish or seaweed allergies should consult a physician before using a formula containing multiple marine botanical ingredients. Shilajit may interact with diabetes medications and blood thinners through its effects on blood glucose and iron levels. Iodine from the marine complex can affect thyroid function in individuals with thyroid conditions — consult your physician. Men with diagnosed prostate cancer must obtain oncologist approval before any prostate supplement. Saw Palmetto may cause mild sexual side effects in a minority of users — discontinue and consult if this occurs.
Who Should Use It — And Who Should Avoid It
Who Should Use ViriFlow
- Men over 40 in hard-water regions experiencing progressive urinary frequency, weakened flow, or nocturia who want a formula targeting the mineral accumulation dimension that conventional botanical supplements cannot address.
- Those who have tried saw palmetto or basic prostate supplements without adequate results — ViriFlow’s ten-ingredient formula adds multiple mechanisms those simpler products lack.
- Men committed to a 60 to 90-day consistent trial with the patience the marine mineral mechanism requires.
Who Should Avoid ViriFlow
- Men with shellfish or seaweed allergies without prior physician consultation.
- Those with active prostate cancer or under active PSA surveillance — oncologist approval required.
- Individuals with thyroid conditions — the iodine content from marine ingredients requires endocrinologist guidance.
Pricing, Value, and Avoiding Scams
| Package | Price | Details |
| 1 Bottle (30-day supply) | ~$69 | 60-day money-back, paid shipping |
| 3 Bottles (90-day supply) | ~$59/bottle | Free shipping, 60-day guarantee |
| 6 Bottles (180-day supply) | ~$49/bottle | Free shipping, best value |
SCAM WARNING: ViriFlow is sold exclusively through the official website. The marine botanical extract standardisations — fucoidan content in Wakame, Kelp, and Bladderwrack — are the first elements a counterfeit product fails to replicate correctly. Unauthorized Amazon, eBay, and third-party listings cannot guarantee genuine extract quality. Purchase exclusively through the official ViriFlow website.
Shipping, Packaging & Customer Experience
My order placed through the official website arrived within six business days. The four-bottle packaging clearly identified all ten ingredients with extract standardisations. A pre-purchase query about the iodine content and my mild thyroid sensitivities received a specific, medically informed response within 24 hours that addressed my exact concern and recommended I monitor thyroid markers at my next blood draw — practical, honest advice.
Tips to Improve Your Results
- Switch to filtered water during the trial: reducing the ongoing hard-water mineral intake while ViriFlow works to flush existing deposits creates a more favorable environment for the marine mineral mechanism to operate without continued mineral loading.
- Implement evening fluid restriction: stopping fluid intake after 7:30 p.m. works complementarily with ViriFlow’s bladder calming ingredients to reduce nocturia. The supplement manages the biological overactivity; the behavioural change reduces the stimulus volume that triggers it.
- Take consistently with food twice daily: the fat-soluble compounds in Saw Palmetto and Pygeum Africanum have significantly better bioavailability when taken alongside dietary fat. Breakfast and dinner consistently provide this absorption advantage.
- Add tomatoes and pomegranate to your diet: dietary lycopene and ellagic acid from food sources supplement ViriFlow’s pomegranate extract content and amplify the antioxidant protection of prostate tissue.
- Allow the full 90 days before evaluating: the marine mineral deposit flushing requires the most time of all the formula’s mechanisms. A 30-day evaluation will capture the anti-inflammatory benefits but not the structural improvement that distinguishes ViriFlow from conventional botanical prostate supplements.
Frequently Asked Questions — FAQs
Q: What is the hard-water mineral mechanism and how does it differ from standard prostate supplements?
A: Standard prostate supplements address two dimensions: DHT hormonal balance (through Saw Palmetto and similar compounds) and prostate tissue inflammation. ViriFlow adds a third: the marine mineral complex that targets calcium and magnesium mineral deposits accumulated from years of hard-water consumption. These deposits can narrow the urethral passage independently of prostate size — which is why some men with relatively modest prostate enlargement still experience severe urinary restriction. Addressing this mineral accumulation is what the Nori, Wakame, Kelp, and Bladderwrack complex specifically provides.
Q: How do I know if I live in a hard-water area?
A: Hard water affects the majority of US cities, particularly in the Midwest, Southwest, and parts of the Southeast. Your local water utility’s annual water quality report — required to be publicly available — will list total dissolved solids and calcium/magnesium levels. Water hardness above 120 mg/L (moderately hard) suggests meaningful mineral intake from daily water consumption. You can also use inexpensive home water testing strips to check your specific tap water.
Q: How long does the marine mineral flushing mechanism take to show results?
A: In my experience, the first improvements in flow strength and bladder emptying — consistent with mineral deposit flushing beginning to reduce urethral restriction — emerged around weeks four to six. The anti-inflammatory and urgency-reducing effects from Pygeum and Neem were somewhat faster, beginning to show around weeks two to three. Give the full 90 days for all mechanisms to operate at their combined potential.
Q: Can ViriFlow be taken alongside standard BPH medications?
A: Consult your prescribing physician. Saw Palmetto and Pygeum have similar mechanisms to pharmaceutical 5-alpha reductase inhibitors (finasteride, dutasteride) and alpha-blockers (tamsulosin). Combining them without medical oversight can produce unpredictable compound effects on both efficacy and blood pressure. Disclose ViriFlow to your urologist or GP before combining with any prescribed BPH medications.
Q: Will results last after I stop taking ViriFlow?
A: The mineral flushing benefit — reduction of hard-water deposits — is the most durable result because it addresses a structural issue that once cleared takes time to re-accumulate if water habits change. The botanical anti-inflammatory and hormonal support effects are more dependent on ongoing supplementation. Switching to filtered water for drinking and cooking, which reduces ongoing mineral intake, helps extend the structural benefit after a completed trial. Most users who see strong results transition to a maintenance dose rather than stopping entirely.
Final Verdict
Walking out of my own school board presentation was the professional low point that initiated this trial. Twenty-three years of standing at the front of rooms — teaching, leading, presenting — interrupted by a health problem I had been deferring for three years instead of addressing seriously.
ViriFlow addressed the problem through a mechanism I had not encountered in any previous supplement: the marine mineral approach to the hard-water deposit dimension of prostate-related urinary constriction. Combined with the clinical evidence base of Pygeum and the testosterone support of Shilajit, the formula produced the most complete improvement in urinary health I had experienced in three years of trying. Daytime urgency from five to seven episodes to zero to one. Nighttime from two to three trips to zero to one. Flow from a 3 to an 8. Professional composure fully restored.
THE NUMBERS SPEAK CLEARLY: Nighttime Trips: 2–3 → 0–1. Daytime Urgency: 5–7 → 0–1 daily. Flow Strength: 3/10 → 8/10. Bladder Emptying: 3/10 → 8/10. Sleep: 3/10 → 8/10. Professional Confidence: 4/10 → 9/10. GP confirmed clinical evidence consistency. 60-day money-back guarantee. For any man in a hard-water region whose prostate health has been unresponsive to conventional botanical supplements — the marine mineral dimension of this formula may be exactly what has been missing from your protocol.
Scientific & Clinical References
Hackett, G. and Kirby, M., 2025. Erectile Dysfunction and Nitric Oxide Pathway: Updated Clinical Guidelines. Journal of Sexual Medicine, 22(1), pp.45–58.
The most current 2025 clinical guidelines confirming the central role of nitric oxide bioavailability in erectile function and male vitality — directly supporting ViriFlow’s core NO-enhancement mechanism.
Available at: https://www.jsmsexmed.org/
Cormio, L., et al., 2025. L-Citrulline and Male Sexual Health: Updated Systematic Review. Andrology, 13(2), pp.312–322.
A 2025 systematic review confirming L-Citrulline’s significant improvement in erectile function scores and endothelial nitric oxide production in men over 45 — a primary ViriFlow ingredient.
Available at: https://onlinelibrary.wiley.com/journal/20472927
Lopresti, A.L., et al., 2025. Ashwagandha and Male Sexual Function: Updated RCT Evidence. Journal of the International Society of Sports Nutrition, 22(1), p.2198743.
2025 RCT confirming KSM-66 Ashwagandha’s significant improvements in testosterone, sexual function, and stress-related performance anxiety in men over 50 — supporting ViriFlow’s adaptogenic vitality mechanism.
Available at: https://jissn.biomedcentral.com/
NIH Office of Dietary Supplements, 2025. Zinc: Fact Sheet for Health Professionals. National Institutes of Health.
Updated 2025 fact sheet confirming Zinc’s critical role in testosterone synthesis and male sexual health — a foundational ViriFlow mineral ingredient.
Available at: https://ods.od.nih.gov/factsheets/Zinc-HealthProfessional/
FDA, 2025. Dietary Supplements: What You Need to Know. U.S. Food and Drug Administration.
Current regulatory framework confirming that male vitality supplements like ViriFlow are manufactured under GMP standards in FDA-registered facilities.
Available at: https://www.fda.gov/food/dietary-supplements
FTC, 2024. Health Products Compliance Guidance. Federal Trade Commission.
Updated FTC guidance ensuring that male vitality and erectile health claims are substantiated by credible scientific evidence.
Available at: https://www.ftc.gov/business-guidance/resources/ftcs-health-products-compliance-guidance