DHT is destroying your hair follicles right now. Here's the evidence-based protocol to stop it — without sacrificing your testosterone.
View the ProtocolThe most potent androgen in your body — and the primary driver of male pattern hair loss.
Your body converts testosterone into DHT (dihydrotestosterone) using an enzyme called 5-alpha-reductase.[1] DHT is 5–10× more potent than testosterone at the androgen receptor[2] and causes hair follicles to progressively shrink until they stop producing hair.
If you are genetically susceptible, more DHT accelerates follicle miniaturization. The intervention is not to lower testosterone — it is to inhibit the 5-alpha-reductase enzyme that converts testosterone to DHT, leaving testosterone itself unchanged.
DHT binds to androgen receptors (AR) in scalp follicles. Susceptibility is governed by CAG repeat length in the AR gene — shorter repeats produce a more transcriptionally active receptor, making follicles hyper-responsive to DHT.[3] DHT shortens the anagen (growth) phase across successive hair cycles, progressively miniaturizing follicles from terminal to vellus hair. In skeletal muscle, DHT is inactivated by the enzyme 3α-HSD before it can activate receptors, explaining why blocking DHT does not impair muscle hypertrophy.[5] Type II 5α-reductase is the dominant isoform in scalp tissue and the primary pharmaceutical target.
Ordered by impact. Start at the top.
The objective is to block 5-alpha-reductase — the enzyme that converts testosterone to DHT. Testosterone stays high. Conversion is curtailed. Every other step in this protocol is a method of achieving this without prescription medication.
Insulin spikes directly upregulate 5-alpha-reductase activity. White bread, soda, processed snacks — these are accelerants for hair loss in susceptible individuals. This is the single fastest dietary change you can make. Eliminate first.
The EGCG polyphenol in green tea competitively inhibits both Type I and Type II 5α-reductase[6] without affecting testosterone. Zero cost, zero side effects. No reason not to.
Lycopene — the carotenoid in tomatoes — inhibits 5α-reductase. Bioavailability from cooked tomatoes (paste, sauce) is significantly higher than raw. Pair with olive oil for fat-soluble absorption.
A 2014 double-blind RCT showed 1000mg/day pumpkin seed oil produced a 40% increase in hair count vs 10% for placebo over 24 weeks.[7] Phytosterols inhibit DHT conversion. Zinc content supports testosterone synthesis.
Squats, deadlifts, and bench press acutely spike testosterone. High testosterone with blocked conversion means more T, lower relative DHT. Avoid sustained moderate cardio (60+ minutes), which can suppress androgens. Prioritise intensity over duration.
One week of sleep restriction to 5 hours per night reduces daytime testosterone levels by 10–15% in healthy young men.[9] Most testosterone is produced during deep sleep. Sleep is the single most underrated lever in this protocol.
Alcohol impairs liver function (required for hormone clearance), depletes zinc, and destroys sleep architecture — undermining three protocol pillars simultaneously. Occasional moderate intake is tolerable. Regular heavy drinking is incompatible with this protocol.
320mg/day. The most extensively studied natural 5α-reductase inhibitor.[10] Fatty acids in the berry extract compete with testosterone for the enzyme's active site. Safety profile is consistently favourable across systematic reviews.
Finasteride (Type II 5α-reductase inhibitor) reduces serum DHT by approximately 70% without lowering testosterone.[4] Multiple trials confirm muscle gains are fully preserved when combined with TRT.[13] This is a prescription medication with documented side effects — an informed clinical conversation is required.
Your diet is the first line of intervention. Load these in. Remove those.
The heuristic: If it generates an insulin spike (sugar, refined flour) or promotes inflammation (fried food), it upregulates 5α-reductase. If it delivers zinc, lycopene, EGCG, or healthy fats, it supports testosterone while inhibiting DHT conversion.
Ranked by evidence quality. All claims are source-cited.
| Supplement | Daily Dose | Primary Mechanism | Evidence | Clinical Notes |
|---|---|---|---|---|
| Pumpkin Seed Oil | 1000mg | Phytosterols inhibit 5α-reductase; zinc supports T synthesis | High[7] | Only natural DHT blocker with a double-blind RCT showing statistically significant hair count increase (40% vs 10% placebo). Take with food. |
| Saw Palmetto | 320mg | Competitive inhibition of Type II 5α-reductase | Moderate[10] | Most studied natural inhibitor. Consistent safety profile across systematic reviews. Efficacy data for AGA is promising; larger RCTs needed for definitive classification. |
| Green Tea Extract (EGCG) | 400mg | Polyphenol competitive inhibition of Type I and II 5α-reductase | Moderate[6] | Strong in vitro mechanistic data. Limited large-scale human RCTs specifically for hair loss. Can be substituted with 2–3 cups of brewed green tea daily. |
| Zinc (bisglycinate) | 25–40mg | Cofactor for T synthesis; natural 5α-reductase inhibitor | Moderate[11] | Deficiency significantly lowers testosterone and impairs DHT regulation. Bisglycinate form has superior bioavailability. Do not exceed 40mg — high doses compete with copper absorption. |
| Vitamin D3 + K2 | 2000–4000 IU | Supports Leydig cell testosterone synthesis via nuclear receptor | Moderate[12] | D deficiency correlates directly with low testosterone. D3 RCT showed significant T increase vs placebo. Take with K2 and a fat-containing meal. Blood test recommended to establish baseline. |
| Creatine Monohydrate | 3–5g | Performance/muscle benefits; may increase DHT:T ratio | Limited[8] | One small study (n=20) showed loading phase raised DHT by 56%. Not replicated at standard doses in larger cohorts. Performance benefits are robust. Monitor if hair-sensitive. ⚠ Use with caution if hair-sensitive |
What actually happens to DHT on testosterone replacement therapy — and the optimal approach.
For clinically low testosterone, TRT is the medically standard treatment. It raises T (for muscle, energy, libido) and DHT as a proportional byproduct. Endogenous conversion produces better tissue ratios than supplementing DHT directly.
Skeletal muscle inactivates DHT via 3α-HSD before it can activate receptors — so there is no muscle benefit over testosterone.[5] Meanwhile, exogenous DHT directly accelerates follicle miniaturization and prostatic growth. The risk-benefit ratio is negative for virtually all use cases.
Finasteride reduces DHT by ~70% while leaving testosterone intact.[4] Clinical trials confirm full preservation of muscle gains and physical performance when finasteride is added to TRT.[13] This combination achieves the protocol's goal: high T, low DHT.
On DHT and muscle hypertrophy: The claim that blocking DHT impairs muscle growth is not supported by clinical evidence. Testosterone is the primary anabolic signal for skeletal muscle. Muscle tissue rapidly inactivates DHT via 3α-HSD.[5] Men in finasteride trials — with DHT reduced 70% — show no impairment in lean body mass or strength outcomes compared to testosterone-only groups.[13]
Frequently asked. Directly answered.
Not necessarily. Higher testosterone increases available substrate for DHT conversion, but whether this causes hair loss depends almost entirely on your genetic sensitivity to DHT — specifically the CAG repeat length in your AR gene.[3] Two men with identical T and DHT levels can have completely different hair outcomes. If you are susceptible, the correct intervention is blocking the conversion enzyme — not lowering testosterone.
This concern derives from a single 2009 study in which a creatine loading protocol raised the DHT:testosterone ratio by 56% in 20 rugby players.[8] This result has not been consistently replicated at standard maintenance doses (3–5g/day) in larger or more diverse cohorts. If you are experiencing active hair loss and notice acceleration after beginning creatine, reducing the dose or discontinuing is a reasonable response. For individuals without follicular DHT sensitivity, the evidence for concern is weak.
Finasteride has been approved and studied for over 30 years. Clinical trials report sexual side effects in approximately 3–5% of users, with resolution in the majority of cases upon discontinuation. Post-Finasteride Syndrome — persistent adverse effects after stopping — has been reported by a subset of patients, though its frequency and pathophysiology remain contested in the medical literature. This is a prescription medication with a non-trivial risk profile. A thorough discussion with a physician, including personal and family medical history, is essential before initiating treatment.
For dietary impact: eliminating sugar and refined carbohydrates is the fastest actionable step, as insulin spikes directly upregulate 5α-reductase. For supplements: saw palmetto (320mg/day) shows measurable effects within 4–6 weeks in studies.[10] Combining saw palmetto + pumpkin seed oil + EGCG creates a multi-pathway inhibition approach. None approach the potency of finasteride; all carry a cleaner side-effect profile.
Yes — this is the central premise of the protocol. Testosterone production and DHT conversion are independently modifiable. Finasteride demonstrates this definitively in clinical settings: DHT is reduced 70% while testosterone remains unchanged or rises slightly.[4] Men with low follicular sensitivity to DHT achieve this outcome without any intervention. The protocol replicates this effect through natural and, if necessary, pharmaceutical inhibition of 5α-reductase.
We went down the same research rabbit hole you did. The information was scattered across forums, supplement marketing copy, and academic papers that required a biochemistry degree to parse. Some of it was wrong. None of it was written the way a knowledgeable clinician would actually explain it to you.
HairMaxxProtocol is the resource we wanted when we started. Every factual claim is sourced to peer-reviewed literature — all references are listed here. Content is updated as new research is published, not as product trends change. For definitions of any technical terms, see our glossary.
The language is intentionally accessible. The science behind each claim is there if you want it — expandable where relevant, fully cited in the sources page.
High T. Low DHT. Full hair.
Medical Disclaimer: The information on this site is for educational purposes only and does not constitute medical advice. It does not substitute for consultation with a qualified physician. Individual hormone levels, genetics, and health status vary significantly. Before beginning any supplement protocol, making significant dietary changes, or considering prescription medications including finasteride, consult your doctor. Nothing on this site constitutes a diagnosis or treatment recommendation.