Does ashwagandha increase testosterone? Read beyond the percentage

What one relevant trial actually found

A 2019 randomized, placebo-controlled crossover trial enrolled 57 overweight men aged 40–70 with mild fatigue. Participants received a specific Shoden ashwagandha preparation or placebo for eight weeks before crossing over. The researchers measured salivary hormones and symptom questionnaires; 43 men completed all 16 weeks. Lopresti et al., 2019: ashwagandha trial in men aged 40–70

The ashwagandha period was associated with a 14.7% greater increase in salivary testosterone than placebo. However, fatigue, vigor, and sexual well-being did not improve significantly more than with placebo. The trial was small and had no washout between periods. These results are preliminary evidence for that preparation and setting, not a demonstrated treatment for clinically diagnosed low testosterone. Lopresti et al., 2019: ashwagandha trial in men aged 40–70

Keep both findings together when evaluating the claim.

Why the extract name belongs in the comparison

Two labels that both say ashwagandha may not contain equivalent preparations. NCCIH notes that studies have used varied preparations and often small samples. It describes evidence for testosterone and sperm-quality effects over two to four months as limited. NCCIH: ashwagandha evidence and safety

When comparing a label with a paper, put these fields side by side:

• Preparation: root, leaf, or a specified combination; powder versus extract.
• Identity: the exact named extract, if the study used one.
• Amount: the full daily serving, including the number of capsules.
• Standardization: what constituent is measured and how it is described.
• Outcome: the actual measurement and the comparison with placebo.

A hypothetical 600 mg root powder and a 300 mg standardized extract cannot be ranked by weight alone. Nor can a result for Shoden automatically be assigned to KSM-66 or another preparation. Matching the name is a starting point for evaluating a study, not a guarantee of equivalent results in your own life.

Keep the goal specific

Before shopping, finish this sentence: “I am considering this because I want help with ___.” Sleep, perceived stress, low libido, and gym performance are separate outcomes. An article about one cannot establish all the others.

If the goal is to investigate persistent low energy or sexual changes, start with the difference between supplement claims and a testosterone diagnosis. If the problem is an inconsistent bedtime, our sleep and recovery guide helps you examine the routine around it.

Safety deserves the same attention as the serving

NCCIH describes short-term use of up to three months as possibly safe, while long-term safety remains uncertain. Reported problems include digestive symptoms, drowsiness, and rare liver injury. It advises against use with thyroid or autoimmune disorders, around surgery, and with hormone-sensitive prostate cancer. Medication interactions include sedatives, thyroid medicines, and some blood-pressure and diabetes medicines. Review suitability with your clinician or pharmacist before use. NCCIH: ashwagandha evidence and safety

Take the complete list of products you use to that review. A sleep blend and a testosterone complex may both contain ashwagandha. Comparing bottles separately can miss the combined exposure.

Apply the evidence to the bottle

Use our testosterone-support comparisons to inspect formulas and serving sizes. Better Man Report shares ownership with JOYMODE; that does not turn a study of an ingredient into a verified result for its finished formula. The same questions about extract identity, dose, population, and measured benefit apply to every product.