How to Increase 5-Alpha Reductase Naturally

Most strategies for naturally increasing 5-alpha reductase activity fall into a handful of categories: resistance exercise, dietary fat intake, specific supplements like creatine, micronutrient adequacy, and reducing exposure to environmental chemicals that suppress the enzyme. The evidence behind each varies widely, from a single study on rugby players to animal research on high-fat diets, and almost none of it comes from large human trials designed to measure 5-alpha reductase directly. That matters, because the enzyme does more than convert testosterone into its stronger cousin dihydrotestosterone; it also produces neurosteroids that influence mood and brain function.

What 5-Alpha Reductase Actually Does

5-alpha reductase is a family of enzymes, not a single one. Three types have been identified so far: types 1, 2, and 3. Type 2 is the one most associated with prostate growth, genital development, and the androgenic effects people usually have in mind when they think about DHT. Type 1 is expressed broadly in the skin and liver from puberty onward, and type 3 turns out to be expressed at higher levels than either type 1 or type 2 across at least 20 different human tissues, including the skin, brain, and mammary gland.¹ Type 1 is not detectable in fetal tissue but becomes permanently expressed in skin at puberty, while type 2 is the dominant form in the prostate and male accessory glands.²

Beyond converting testosterone to DHT, these enzymes also convert progesterone into a precursor of allopregnanolone, a neurosteroid that acts as a powerful modulator of GABA receptors in the brain.³ This is why drugs that block 5-alpha reductase (like finasteride) have been linked to mood changes and depression-like symptoms: they don’t just lower DHT, they also reduce allopregnanolone production in the brain.⁴ So when someone asks about increasing 5-alpha reductase naturally, the downstream effects extend well beyond hair growth and prostate tissue.

Resistance Training and Muscle DHT

The strongest mechanistic evidence for naturally boosting 5-alpha reductase activity comes from resistance exercise, though the human data is still limited. In rat models of type 2 diabetes, resistance training significantly elevated both 5-alpha reductase levels and DHT in skeletal muscle. Researchers confirmed this was genuinely enzyme-driven by showing that administering a 5-alpha reductase inhibitor blocked the exercise-induced DHT increase.⁵ A follow-up study from the same research group found that levels of 5-alpha reductase and DHT in muscle were significantly elevated immediately and one hour after a bout of resistance exercise, and that this increase activated downstream signaling pathways involved in muscle growth and glucose uptake.⁶

Endurance exercise may also play a role. In obese rats subjected to fasting, endurance training led to a significant increase in the expression of the 5-alpha reductase gene in testicular tissue.⁷ The caveat with all of this research is that it’s in rodents. We know that resistance training raises testosterone and DHT in humans, and the rat data gives us a plausible explanation for how, but no human trial has directly measured changes in 5-alpha reductase enzyme expression in muscle before and after a training program. Still, if you’re looking for a lifestyle factor with the most plausible upside and the fewest downsides, regular strength training is the most reasonable place to start.

Dietary Fat Intake

Fat in the diet appears to influence 5-alpha reductase activity, though the evidence is indirect and mostly from animal work. In neonatal rats, a high-fat diet elevated prostate 5-alpha reductase type 2 gene expression and increased circulating DHT levels within two weeks. Interestingly, type 1 expression and testosterone itself didn’t change between the high-fat and normal-fat groups, suggesting the fat specifically affected the conversion step rather than overall hormone production.⁸

Human evidence runs in the same direction, but from the opposite angle. A systematic review and meta-analysis of intervention studies found that men placed on low-fat diets had lower DHT levels compared to those on higher-fat diets.⁹ The review also found reductions in total and free testosterone, so the effect wasn’t limited to the conversion step. But the DHT drop is consistent with the idea that adequate dietary fat supports the enzymatic pathway. This doesn’t mean loading up on saturated fat is a good strategy; the long-term metabolic trade-offs of a very high-fat diet can be considerable. It does mean that severely restricting fat may lower DHT production, and that moderate fat intake probably helps maintain normal 5-alpha reductase function.

Creatine Supplementation

The most striking supplement finding comes from a study on college-aged rugby players who took creatine monohydrate for three weeks. After a seven-day loading phase, their DHT levels rose by about 56%, and the ratio of DHT to testosterone increased by 36%. After shifting to a maintenance dose for another two weeks, DHT remained roughly 40% above baseline. Testosterone itself didn’t change, which points to an increase in 5-alpha reductase conversion rather than a rise in raw hormone production.¹⁰

This is one of the most frequently cited studies in online discussions of natural DHT enhancement, and it’s worth understanding its limitations. The sample was small (about 20 participants per group), the population was specific (young, athletic men), and the study has not been replicated in a larger trial. A thesis from the same research group confirmed the statistical significance of the shift in DHT-to-testosterone conversion ratio, but this was essentially the same dataset analyzed further.¹¹ No one has definitively explained why creatine would increase 5-alpha reductase activity. The effect might not replicate in different populations, at different doses, or over longer periods. But for people specifically interested in this enzyme, creatine is one of the few supplements with any direct human data pointing in the right direction.

The Zinc Paradox

Zinc has a genuinely complicated relationship with 5-alpha reductase, and oversimplified advice to “take more zinc” can backfire. On one hand, zinc deficiency clearly impairs the enzyme. Rats fed a zinc-deficient diet showed significantly less conversion of testosterone to DHT in the liver.¹² Correcting a true deficiency would therefore be expected to restore normal enzymatic function.

On the other hand, at higher concentrations applied directly to human skin tissue, zinc was a potent inhibitor of 5-alpha reductase. At the highest concentrations tested, zinc completely shut the enzyme down.¹³ This in-vitro finding doesn’t necessarily translate to what happens when you take a zinc supplement orally, since tissue concentrations from supplementation are far lower than those used in the lab. But it does suggest a U-shaped relationship: too little zinc means the enzyme can’t function properly, while flooding tissue with zinc can suppress it. The practical takeaway is that if you’re zinc-deficient, getting enough zinc likely helps. If you’re already adequate, megadosing zinc won’t boost 5-alpha reductase and may do the opposite locally.

The Gut Microbiome as an Androgenic Organ

One of the more surprising areas of recent research is the discovery that gut bacteria themselves produce 5-alpha reductase and meaningfully influence circulating androgen levels. In germ-free mice (animals raised with no gut bacteria at all), free DHT levels in the intestine were extremely low compared to mice with a normal gut microbiome. The bacteria appear to both produce DHT locally and liberate it from an inactive form, resulting in very high free DHT concentrations in the colon of healthy mice and, according to the same research group, in human intestinal content as well.¹⁴

More recent work has shown that this isn’t just a local gut phenomenon. In women, the relative abundance of microbial genes for 5-alpha reductase type 1 was positively associated with the circulating DHT-to-testosterone ratio. Specific bacterial species, particularly Odoribacter splanchnicus and Parabacteroides distasonis, were linked to both higher microbial 5-alpha reductase gene abundance and a higher circulating DHT-to-testosterone ratio. In female mice, DHT levels in blood draining from the gut (portal vein) were nearly 87% higher than in blood from the general circulation, suggesting the gut is actively exporting DHT into the body.¹⁵

What this means practically is less clear. No one has shown that taking a probiotic containing these specific species reliably increases your DHT levels. But the research implies that a healthy, diverse gut microbiome supports androgen metabolism in ways that go beyond what the body’s own tissues can do alone. Factors known to support microbial diversity, like dietary fiber variety, fermented foods, and avoiding unnecessary antibiotics, may indirectly support this microbial 5-alpha reductase activity. This is genuinely early-stage science, but it’s intriguing enough that it’s worth watching.

Reducing Environmental Chemical Exposure

If some interventions can push 5-alpha reductase activity up, certain environmental chemicals appear to push it down. Bisphenol A (BPA), the plasticizer found in many food containers and receipts, significantly decreased both type 1 and type 2 5-alpha reductase gene expression in the prostate of rats. The BPA-treated animals also had lower circulating DHT.¹⁶

A separate line of research identified several industrial phenolic compounds as moderate to potent inhibitors of human 5-alpha reductase type 1. Among those tested, pentabromophenol (a flame retardant) was the most potent, and 4-nonylphenol (used in detergents and plastics) also showed meaningful inhibition. The researchers noted that this inhibition may reduce both DHT and neurosteroids like allopregnanolone in brain tissue.¹⁷ While these are lab findings that don’t directly prove real-world exposures suppress 5-alpha reductase in people, they add to the broader endocrine-disruptor picture. Minimizing contact with plasticizers and industrial chemicals isn’t just general health advice; it may have specific relevance to maintaining androgen metabolism.

Sleep Deprivation and the Brain’s 5-Alpha Reductase

Sleep’s relationship to 5-alpha reductase is counterintuitive and worth understanding separately from the goal of “increasing” the enzyme. In the brain, sleep deprivation actually enhances 5-alpha reductase expression and activity, at least in the prefrontal cortex. This drives up allopregnanolone levels and appears to mediate some of the psychosis-like and mania-like effects of prolonged sleep loss. In animal models, blocking 5-alpha reductase with finasteride reversed the hyperactivity, risk-taking behavior, and sensory gating deficits caused by sleep deprivation.¹⁸

Other research has found that even partial sleep disruption elevated 5-alpha reductase gene expression in the brainstem, and that REM sleep deprivation specifically drove increases in both the brainstem and hippocampus. Expression returned to baseline after a short period of sleep recovery.¹⁹ So while sleep deprivation technically “increases” 5-alpha reductase in the brain, the context is a stress response, not a health benefit. This is the body overproducing neurosteroids in response to a crisis, and the behavioral consequences are negative. Good sleep likely keeps brain 5-alpha reductase in a healthy range rather than driving it into overdrive.

Insulin Resistance and Metabolic State

There’s a consistent association between higher insulin levels, insulin resistance, and elevated 5-alpha reductase activity. In both men and women, 5-alpha reductase activity correlated positively with fasting insulin, insulin secretion during a glucose tolerance test, and a standard measure of insulin resistance.²⁰ A meta-analysis in women with polycystic ovary syndrome (PCOS) confirmed this link, finding increased 5-alpha reductase activity that was significantly associated with insulin resistance regardless of whether the women were obese.²¹

This creates an uncomfortable paradox for anyone trying to increase 5-alpha reductase. The metabolic state most strongly associated with higher enzyme activity is insulin resistance, a condition linked to type 2 diabetes, cardiovascular disease, and a host of other problems. In women with PCOS, elevated 5-alpha reductase is part of the pathology, not a benefit. This doesn’t mean becoming insulin resistant is a “strategy,” obviously. But it does help explain why metabolically unhealthy individuals sometimes have higher DHT levels, and it’s a reminder that more 5-alpha reductase activity isn’t always better. The goal for most people should be enzyme activity that sits in a healthy physiological range, supported by exercise and adequate nutrition, not an activity level driven by metabolic dysfunction.

DHT’s Trade-Offs and Why Context Matters

Before pursuing any strategy to increase 5-alpha reductase, it helps to be honest about what more DHT actually does to the body. DHT is essential for prostate development and growth, external genital development, and male patterns of facial and body hair. It’s also implicated in benign prostatic hyperplasia and male-pattern baldness.²² More 5-alpha reductase activity means more DHT reaching the prostate, more DHT reaching the scalp’s hair follicles, and more DHT driving sebaceous gland activity in the skin. If you’re genetically predisposed to hair loss, increasing 5-alpha reductase could accelerate it. If you have a family history of prostate issues, pushing DHT higher is probably unwise without medical guidance.

The neurosteroid side of the equation gets less attention but may matter just as much. 5-alpha reductase converts progesterone into a precursor of allopregnanolone, which is one of the brain’s most potent calming signals. When researchers block 5-alpha reductase with drugs, both DHT and allopregnanolone drop. The allopregnanolone decrease has been linked to depression-like behavior and impaired neurogenesis in animal models.⁴ For people interested in 5-alpha reductase primarily for neurosteroid support and mood, the calculus is different than for someone chasing androgenic effects. The interventions with the best risk-benefit profile, resistance training, adequate dietary fat, correcting nutrient deficiencies, minimizing endocrine-disrupting chemical exposure, all support the enzyme’s function without pushing it to supraphysiological levels.

Supplements and Herbs That Inhibit Rather Than Help

People searching for ways to increase 5-alpha reductase should also know which popular supplements do the opposite. Saw palmetto, widely marketed for prostate health, is used specifically because it inhibits 5-alpha reductase. The same goes for certain soy isoflavones, green tea catechins, and reishi mushroom extracts, all of which have shown 5-alpha reductase inhibition in various studies. If you’re taking any of these and wondering why your DHT might be low, the supplement itself could be working against you.

Sorghum extract is another example from the research literature. An ethyl-acetate extract of sorghum decreased gene expression of both androgen receptor and 5-alpha reductase type 2 in a rat model of benign prostatic hyperplasia, and was proposed as a potential therapeutic agent for that condition.²³ Anyone concerned about their 5-alpha reductase activity should review their full supplement regimen for ingredients that are actually designed to suppress the very enzyme they want to support. The “natural health” market is overwhelmingly focused on lowering DHT, not raising it, so accidental self-sabotage is a real possibility.

What a Practical Approach Looks Like

Given how scattered the evidence is, it helps to sort the available strategies by confidence level. Resistance training has the most consistent mechanistic support and the broadest health benefits. Maintaining moderate-to-adequate dietary fat is supported by both animal data and a human meta-analysis showing that low-fat diets reduce DHT. Correcting a zinc deficiency likely restores enzyme function, while megadosing zinc beyond adequacy is counterproductive. Creatine supplementation has a single suggestive human trial showing a meaningful DHT increase, but the study was small and hasn’t been replicated. Reducing BPA and industrial phenol exposure is consistent with the precautionary principle and has broader health relevance.

For anything related to gut microbiome support, the science is fascinating but too early to translate into specific product recommendations. Eating a varied, fiber-rich diet and maintaining gut health is sensible regardless. And critically, if your primary concern is neurosteroid production and mood rather than androgenic effects, the same strategies apply because the same enzyme handles both pathways. The difference is that the risks of overshoot are different: too much DHT can mean hair loss and prostate growth, while the neurosteroid side is self-limiting in ways we don’t yet fully understand. Talking with an endocrinologist or urologist before aggressively pursuing higher 5-alpha reductase activity makes sense for anyone with a relevant medical history.