Fenugreek seed extract has emerged as a natural testosterone and libido enhancer in multiple clinical trials.

It acts by reducing conversion of testosterone to DHT and enhances androgenic activity.

A 2020 meta-analysis of clinical trials concluded that fenugreek supplementation has a significant positive effect on serum testosterone levels in men.

In fact, 4 out of 6 human trials analyzed showed increased total or free testosterone with fenugreek extract vs placebo.

Tongkat Ali (also called Longjack) is a Southeast Asian botanical famed for enhancing libido, energy, and testosterone.

Human studies have repeatedly shown Tongkat Ali’s ability to improve stress hormone profiles and increase testosterone.

In a 2013 placebo-controlled study of moderately stressed adults, 4 weeks of Tongkat Ali led to a 37% increase in testosterone levels and a 16% reduction in cortisol (the stress hormone), compared to baseline

Boron is a trace mineral that has demonstrated notable effects on hormone levels and inflammation.

In one recent trial, the results were striking: free (active) testosterone levels increased, dihydrotestosterone (DHT) rose, and estrogen (estradiol) and sex-hormone binding globulin (SHBG) significantly decreased.

Ashwagandha is a renowned adaptogenic herb known for stress relief and hormonal support, shown to have have robust clinical backing.

Multiple placebo-controlled studies show ashwagandha supplementation can reduce stress, lower cortisol levels, and modestly increase testosterone in men.

For example, an 8-week trial of men taking ashwagandha saw a 14–15% increase in testosterone levels versus placebo.

Shilajit is a mineral-rich Ayurvedic compound prized as a “rasayana” (rejuvenator) for enhancing energy and vitality.

Clinical research on purified Shilajit has demonstrated significant testosterone-boosting effects.

In a double-blind trial, middle-aged healthy men taking purified Shilajit twice daily for 90 days saw significant increases in total and free testosterone, as well as DHEA (a vitality hormone), compared to placebo.

In that study, Shilajit raised these hormone levels by roughly 20% over baseline, suggesting enhanced reproductive and anabolic function.

Epimedium is an herb traditionally used as an aphrodisiac and for male virility.

Its active flavonoid, icariin, has been studied for pro-testosterone and pro-erectile properties.

Modern research reviews indicate Epimedium and its compounds are beneficial for male reproductive health, likely by “stimulating testosterone production, reducing oxidative stress, and activating testicular pathways.”

Clinical data on Epimedium has shown efficacy in improving erectile function in traditional formulations.