Yes, natural steroids exist both inside your body and in the foods you eat. Your body produces dozens of steroid hormones on its own, and certain plants contain compounds with a steroid-like molecular structure. These aren’t the same as synthetic anabolic steroids used in bodybuilding, but they play real biological roles and some have measurable effects on muscle and hormone levels.
Your Body Already Makes Steroids
The word “steroid” refers to a specific molecular shape, not a single substance. Your adrenal glands alone produce more than 30 different steroid compounds, and your gonads and placenta make others. All of them start from the same raw material: cholesterol. Your cells convert cholesterol into whichever steroid hormone is needed at the moment, synthesizing it on demand rather than storing it.
These natural steroids fall into a few major categories. Cortisol, the most well-known glucocorticoid, accounts for about 95% of your body’s glucocorticoid activity. It mobilizes fatty acids for energy, increases blood sugar by stimulating glucose production in the liver, and shifts protein metabolism toward the liver and away from other tissues. Aldosterone, a mineralocorticoid, regulates sodium and water balance. Testosterone and estrogen, both steroid hormones, drive reproductive development and influence muscle mass, bone density, and mood.
Vitamin D is another natural steroid most people don’t think of that way. Once your skin produces it from sunlight (or you get it from food), your kidneys convert it into its active hormonal form, which functions through a receptor that belongs to the steroid receptor gene family. Its central job is regulating calcium and phosphorus levels by promoting calcium absorption in the intestine and, when needed, pulling calcium from bone and increasing its reabsorption in the kidneys.
Plant Steroids That Affect Muscle
Some plants produce their own steroid-like compounds called phytoecdysteroids. The two that get the most attention in fitness circles are ecdysterone (found in spinach and quinoa) and turkesterone (found in the plant Ajuga turkestanica). These compounds have a steroid backbone but work differently from testosterone. They don’t bind to the androgen receptor. Instead, they appear to activate a cell-signaling pathway that boosts protein synthesis directly in muscle cells.
In lab studies using muscle cell cultures, phytoecdysteroids increased protein synthesis by up to 20%. Animal research has shown increases in muscle fiber size along with elevated levels of insulin-like growth factor 1 (IGF-1), a key growth signal. Turkesterone produced increases in body weight comparable to a synthetic anabolic steroid in animal models, without showing androgenic effects like prostate growth or hormonal disruption.
The catch is bioavailability. Ecdysterone has a urinary half-life of roughly 3 hours, meaning your body clears it fast. After a single 50-milligram dose, only about 21% of the compound (on average) was recovered in urine as the parent drug or its metabolites, suggesting a significant portion either isn’t absorbed or gets eliminated through other routes. Getting meaningful doses from food alone is also difficult. Spinach contains between 50 and 800 micrograms of ecdysterone per gram depending on growing conditions, so you’d need to eat an impractical amount to match supplement doses used in studies.
The World Anti-Doping Agency added ecdysteroids to its Monitoring List in 2020, meaning it’s tracking the compounds to decide whether they should eventually be banned in competition. They’re not currently prohibited.
Herbs That Support Testosterone Production
A separate category of natural compounds doesn’t contain steroids itself but may nudge your body to produce more of its own. Ashwagandha is the best-studied example. In an 8-week randomized, placebo-controlled crossover trial involving overweight men, ashwagandha supplementation was associated with a 14.7% greater increase in testosterone and an 18% greater increase in DHEA-S (a precursor hormone) compared to placebo. Both results were statistically significant.
Fenugreek seeds contain steroidal saponins, including diosgenin, which serves as a chemical precursor for the synthesis of sex hormones. Diosgenin has a long history as a starting material in pharmaceutical steroid production and has shown activity in hormone-related pathways, though the evidence for meaningful testosterone increases from fenugreek supplementation in humans is less consistent than for ashwagandha.
How Natural Steroids Differ From Synthetic Ones
The synthetic anabolic steroids associated with bodybuilding are modified versions of testosterone, often altered at a specific position on the molecule (called 17-alpha-alkylation) so they can survive passing through the liver when taken orally. That modification is precisely what makes them toxic. Use of these compounds is linked to a distinctive pattern of liver injury marked by severe, prolonged jaundice that can last 2 to 4 months, with bilirubin levels reaching dangerous heights. This typically shows up 1 to 6 months after starting a supplement regimen.
Plant-derived ecdysteroids don’t carry this same structural modification and haven’t shown the same liver toxicity profile. That said, the supplement industry is poorly regulated, and products marketed as “natural steroids” sometimes contain undeclared synthetic compounds. Contamination with actual anabolic steroids has been documented in bodybuilding supplements, which is one reason USADA warns athletes to be cautious.
What “Natural Steroid” Actually Means
The term gets used loosely, and it helps to separate three distinct things. First, your body’s own steroid hormones: cortisol, testosterone, estrogen, aldosterone, and active vitamin D. These are genuine steroids by chemical definition, and they run essential systems from metabolism to bone health. Second, plant compounds like ecdysterone and turkesterone that have a steroid structure and can influence protein synthesis in muscle, but through non-androgenic pathways. Third, herbs like ashwagandha and fenugreek that don’t contain steroids themselves but may modestly increase your body’s production of testosterone or related hormones.
None of these produce effects anywhere close to synthetic anabolic steroids. The 14.7% testosterone boost from ashwagandha, while real, is a fraction of what exogenous testosterone injections deliver. The muscle-building potential of ecdysterone is promising in cell and animal studies but limited by rapid clearance and uncertain absorption in humans. For someone looking for a safe, legal edge, these compounds offer modest, incremental support. They are not a shortcut to the results associated with pharmaceutical steroids.