Saw Palmetto
Also known as: Serenoa repens, Permixon, Sabal serrulata, Liposterolic extract
Lower numbers = closer to natural. Higher numbers = more enhanced.
Why this rating?
An over-the-counter plant extract with weak 5-alpha-reductase inhibiting activity. It provides no anabolic or androgenic effect, if anything it mildly opposes DHT, and is used cosmetically for hair and prostate. It does not move the natural ceiling. Rated 1 (basically natty).
Overview
The most commonly used "natural finasteride": a berry extract that inhibits 5-alpha-reductase weakly. The one head-to-head trial against finasteride is the honest summary of its value: it works, and it works considerably less well. It exists in this archive because people ask whether they can avoid finasteride, and the answer deserves a real number rather than a shrug.
Important Warnings
- •Substantially less effective than finasteride: 38% vs 68% regrowth over two years in the one head-to-head trial
- •Regrowth in that trial occurred only at the vertex, with significantly smaller magnitude than finasteride
- •Useless against DHT-derivative compounds, exactly like finasteride
- •Supplement-grade product quality and standardization vary between brands
- •Not a realistic sole defence for an aggressive cycle in a DHT-prone individual
Purpose & Use Cases
Milder Alternative For People Who Will Not Take Finasteride
The realistic use case. For someone who refuses a pharmaceutical 5-AR inhibitor over side-effect concerns, this is a weaker but genuinely non-zero option, with the honest caveat that weaker DHT suppression means weaker hair protection.
Benign Prostatic Hyperplasia
Its longer-standing use, and the reason standardized extracts are regulated as medicines in some European countries.
Benefits
- Available over the counter with no prescription
- In a two-year head-to-head trial, 38% of saw palmetto users showed hair regrowth
- Milder side-effect profile than pharmaceutical 5-AR inhibitors
- Does not produce the degree of DHT suppression associated with finasteride side-effect reports
- No HPT axis interaction and no PCT implications
- Inexpensive
Good to Know
The head-to-head number: 38% versus 68%
The one trial directly comparing them (Rossi et al. 2012) randomised 100 men with androgenetic alopecia to either 320mg saw palmetto or 1mg finasteride daily for two years. At 24 months, 68% of the finasteride group showed hair regrowth versus 38% of the saw palmetto group, and the saw palmetto regrowth occurred only in the vertex, with a significantly smaller magnitude. It works. It works about half as often, in a smaller area.
It inherits finasteride's blind spots
Because it works on the same enzyme, it has the same limitation: it can only help when an androgen is actively being converted to DHT. On Masteron, Winstrol, Anavar, Proviron or Primobolan there is nothing to block, so it does nothing, exactly like finasteride, only weaker. Minoxidil, not saw palmetto, is the answer there.
"Natural" does not mean mechanism-free
It is being taken specifically to lower DHT. If the concern driving someone away from finasteride is the idea of suppressing DHT at all, saw palmetto is a smaller dose of the same idea rather than a different approach.
Supplement, not a standardized drug
The trials use a specific standardized liposterolic extract. Retail supplements vary in extract type, standardization and actual content, so the trial results do not automatically transfer to whatever is on the shelf.
Dosage Guidelines
| Experience Level | Dosage Range |
|---|---|
| Beginner | 160 – 160 mg/day |
| Intermediate | 320 – 320 mg/day |
320mg/day of standardized liposterolic extract is the dose used in the head-to-head trial against finasteride, and effective doses in the literature have ranged from 160 to 320mg daily. The standardization matters more than the milligram number, trials use a specific liposterolic extract, and an arbitrary supplement labelled "saw palmetto" at the same milligram figure is not necessarily the same thing. Like any 5-AR intervention it is a continuous commitment rather than a course, and effects on hair take months.
Pharmacokinetics vary by extract and standardization, and "saw palmetto" is not one standardized drug. The liposterolic extract used in trials is a specific preparation, and supermarket supplements are not necessarily equivalent to it.
Side Effects
Gastrointestinal upset
uncommonNausea or stomach discomfort, generally mild and often reduced by taking it with food.
Take with a meal.
Mild sexual side effects
rareReduced libido or erectile difficulty are reported, mechanistically plausible for any DHT-lowering agent, though at a much lower rate than pharmaceutical 5-AR inhibitors, consistent with its weaker enzyme inhibition.
Discontinue if it occurs; effects are not expected to persist.
Headache
rareOccasionally reported.
Usually transient.
Product variability
commonAs a dietary supplement it is not manufactured to pharmaceutical standards. Actual extract content and standardization vary between products, so two bottles labelled 320mg are not necessarily equivalent.
Choose a standardized liposterolic extract from a manufacturer with third-party testing.
General Mitigation Strategies
Genuinely well tolerated: this is the mildest option in the DHT category, and the mildness is inseparable from the reduced efficacy. The realistic issue is not toxicity but disappointment: someone relying on it alone during a cycle that is aggressively attacking their hairline is likely to lose ground.
Post Cycle Therapy (PCT)
No HPT axis suppression. No PCT implications.
How It Works
The liposterolic extract of Serenoa repens contains fatty acids and phytosterols reported to inhibit both isoforms of 5-alpha-reductase, reducing conversion of testosterone to DHT. The inhibition is far weaker than that produced by finasteride or dutasteride, which is the mechanistic explanation for the efficacy gap seen when they are compared directly.
Hormonal & Androgenic Profile
N/A: not an androgen.
Not an aromatase or estrogen tool.
Reported to weakly inhibit 5-alpha-reductase, the same enzyme finasteride and dutasteride target, but far less potently. That means it shares finasteride's LIMITATIONS as well as its mechanism: it is useless against DHT-derivatives (nothing to block), and the theoretical concern about blocking the protective conversion of 19-nors applies in principle here too, at a much smaller magnitude.
No documented cardiovascular effect.
Fundamentals
Reference on the practices relevant to Saw Palmetto: how they are done and where they go wrong. Not a recommendation to use it.
Common Stacks
- Saw Palmetto + Minoxidil: for someone who will not take finasteride but wants to do something
- Do not stack with finasteride or dutasteride, same target, redundant
- Ineffective against DHT-derivatives (Masteron, Winstrol, Anavar, Proviron, Primobolan)
Legal Status
Sold as a dietary supplement worldwide, with no prescription required and no FDA approval for any indication. In parts of Europe standardized extracts such as Permixon are regulated as medicines for benign prostatic hyperplasia. As a supplement it is not subject to pharmaceutical manufacturing standards, so content varies between products.
Legal status varies by country and changes over time. This is a general summary, not legal advice.
WADA Status
A dietary supplement with no performance-enhancing action and no anabolic activity. Not listed on the WADA Prohibited List. Note that 5-alpha-reductase inhibitors were removed from the List years ago. They were once banned as masking agents, but are not prohibited now.
References
- Rossi et al. (2012), Int J Immunopathol Pharmacol: Comparative Effectiveness of Finasteride vs Serenoa repens in Male Androgenetic Alopecia: A Two-Year Study
- Rossi et al. (2012), full PDF
- Journal of Cosmetic Dermatology (2025): Safety and Efficacy of a Proprietary Bioactive Fatty Acids Extract From Saw Palmetto for Promoting Hair Growth: 90-Day Results