Build your hair-loss stack.
Six questions.

The honest test: count hairs from the daily shower drain or pillow for one week, and compare front-to-side scalp photos under the same lighting at 3-month intervals. Normal shedding is 50-100 hairs/day. Sustained >150/day is meaningful. Photos do not lie — selfies in your own bathroom under your own light, every 90 days, will tell you within a year. Anything sudden, patchy, or accompanied by scalp pain is NOT typical androgenetic alopecia and warrants a dermatologist visit before any treatment.

Norwood is the standard 7-stage classification for male pattern baldness. Stage 1 is no recession. Stage 2 is slight temple recession (very common, often stable). Stage 3 is the classic "M-shape" hairline. Stage 4 adds vertex/crown thinning. Stages 5-7 represent progressive merger of the two zones into a horseshoe pattern. Most treatment decisions branch at Norwood 2-3: this is the window where finasteride + minoxidil stop progression most effectively. Past Norwood 4, transplant becomes the only path to full restoration, but medication still stabilizes what remains.

Decades of RCT data: finasteride 1mg/day stops progression and modestly regrows hair in 80-90% of men with androgenetic alopecia at five-year follow-up. The trade-off is the side-effect profile: 1-4% incidence of sexual side effects (libido, erectile function, ejaculate volume) in trials, most reversible on discontinuation. Post-finasteride syndrome — persistent symptoms after stopping — exists in case reports but is contested in incidence. Honest take: if your hair matters to you and you understand the trade-off, finasteride is the most evidence-backed pharmacological tool that exists. If the side-effect risk is unacceptable, topical finasteride and oral minoxidil are reasonable alternatives.

Topical minoxidil 5% has the longest track record and is OTC. Sinclair 2017 demonstrated low-dose oral minoxidil (0.25-5mg/day) is comparable or slightly superior, with the major advantage of convenience (one pill vs twice-daily liquid). Oral has its own profile: hypertrichosis (extra body hair), occasional fluid retention, dizziness. It is off-label everywhere but Rx-prescribed by most major telehealth services (Hims, Keeps, Numan) as an off-label use. Most people now stack low-dose oral minox + finasteride and skip the topical.

For Norwood 4+ men with stable donor density and a realistic understanding of the limits, yes — FUE/DHI transplants have 90%+ graft survival and produce permanent results. Two conditions are non-negotiable: (1) the loss must be stabilized for 1-2 years before surgery (otherwise the surrounding native hair recedes around the grafts and the result looks isolated within 5 years), and (2) ongoing medical maintenance (finasteride + minoxidil) must continue post-op. Skipping either creates a worse outcome than no transplant. Turkey clinics dominate the global market at $3-5k; quality varies wildly — verify the surgeon does the actual work (not just techs), check 12+ month before-after portfolios.

The major telehealth platforms (Hims, Keeps, Roman, Numan, MOSS, Manual) are real licensed-clinician operations regulated by local medical boards. They prescribe identical-molecule generic finasteride and minoxidil at lower prices than retail pharmacies in most cases. Trade-offs: the consultations are async questionnaires (no in-person exam), which is fine for typical AGA but inadequate if your loss pattern is atypical. Most platforms auto-renew aggressively — read the cancellation policy before signing up. They are NOT a substitute for a dermatology consultation when something looks wrong.

Biotin: deficiency is rare; for non-deficient users, supplementation does nothing measurable. Saw palmetto: weak phytotherapy evidence (smaller effect than finasteride), worth a try only for users refusing pharmaceutical 5-AR inhibitors. Collagen: zero direct evidence for hair growth in non-deficient adults. Iron and vitamin D: real benefit IF you are deficient (especially women with hair shedding) — test first. Most "hair vitamin" subscriptions are profit-motivated bundles of common nutrients at fancy prices. Spend the money on minoxidil + finasteride or a derma roller — that is where the evidence sits.

Minoxidil: visible effect at 4-6 months, plateau by 12-18 months. Initial 4-8 week "shedding phase" is normal and predictive of response. Finasteride: stabilization at 3-6 months, modest regrowth visible at 6-12 months. Derma roller (paired with minox): adjunct effect at 4-6 months. Transplant: full result at 9-12 months post-op. Discontinuation: minoxidil gains reverse in 3-6 months, finasteride gains reverse in 6-12 months. These are not 4-week protocols — every single one of them is a multi-year commitment.

Partially. Female-pattern hair loss has different mechanisms (diffuse thinning, often hormonal) and different protocols. Minoxidil 5% topical is FDA-approved and works. Finasteride and dutasteride are NOT recommended for women of reproductive age (teratogenic — birth defect risk). Spironolactone is an oral anti-androgen sometimes prescribed off-label for women. Iron deficiency is a far more common cause of female hair loss than is AGA — get ferritin tested before any treatment. See a dermatologist familiar with female-pattern alopecia.

Always for: sudden hair loss (weeks not months), patchy or circular bald spots (possible alopecia areata or fungal infection), scalp pain or burning, hair loss with rash or scaling, hair loss in unusual patterns (no Norwood match), persistent shedding after a known stressor (illness, surgery, severe diet) for more than 12 months. Also if you are under 25 with aggressive Norwood 4+ pattern — that progression rate sometimes responds better to dutasteride than finasteride and benefits from in-person evaluation. Telehealth questionnaire flows do not catch atypical cases.

Biotin gummies for non-deficient users. "DHT-blocking shampoos" alone — DHT is produced systemically, rinse-off topicals barely engage. Hair growth supplements with proprietary blends. Laser caps (low-level light therapy): small inconsistent effects, expensive, adjunct at best. Castor oil daily as a regrowth therapy. PRP without underlying minox+fin. Anything promising regrowth on a fully bald scalp without surgery or proven medication. Stem-cell hair treatments outside of clinical trials. And the entire shadow market of unregulated "RU58841" / "CB-03-01" / "PP-405" research compounds — they exist but the safety data is non-existent.