Do testosterone boosters work?

Short answer

No. Most booster ingredients failed to raise testosterone, and people who trained while taking them gained the same muscle and strength as with a placebo. Some ingredients even lowered testosterone.

Do testosterone boosters work?
'Take it → more testosterone → more muscle' — does this formula hold?
Testosterone boosters that claim to 'naturally raise testosterone and build muscle' sell widely. We checked, step by step, whether hormone levels actually rise and whether that means more muscle.
We looked inside 50 products
5% of ingredients had no hormone research at all
A review of 50 boosters sold online found 90% advertised that they 'boost testosterone'. Of the 109 ingredients inside, only 24.8% had data showing a rise, 61.5% had no data at all, and 10.1% had data showing they lower testosterone.
Pooling the research: most failed
27 ingredients, 52 studies: mostly no rise in testosterone
An analysis of 52 studies from the last 20 years covering 27 booster ingredients found most failed to raise testosterone. Even tribulus, a flagship ingredient, showed no hormone change in 8 of 10 studies with 483 people.
Some ingredients lowered it
D-aspartic acid 6 g: about 14% lower in 2 weeks
In a study of 24 people, the group taking 6 g a day of D-aspartic acid saw testosterone drop from 5.9 to 5.1 in 2 weeks. That's like 100 becoming 86. The 3 g group did not change.
So did muscle grow more?
12 weeks of use: muscle and strength matched placebo
22 people lifted weights for 12 weeks while taking 6 g of D-aspartic acid or a placebo. Testosterone didn't change, both groups raised calf strength by 17%, and muscle grew about the same. Another study with 3 g for 28 days also found no difference in muscle or strength.
What about fenugreek, the one that supposedly works?
A tiny rise, but no difference in muscle
A 2026 analysis of 6 studies found fenugreek raised total testosterone very slightly, but the form your body uses directly did not change. Another analysis of 449 people found no meaningful difference in lean mass (muscle and everything except fat) or leg strength.
Can you trust the reviews?
Filtering out fake reviews cut 'I got stronger' by 93%
An analysis of reviews for 5 top-selling boosters on Amazon found that after filtering out untrustworthy reviews, reports of better strength or endurance fell by 93% and of higher libido by 91%. Of 37 human studies on these products' ingredients, 30% found a rise in testosterone.
Bottom line: boosters don't change your muscle
Hormones mostly did not rise, and muscle stayed the same
Most booster ingredients failed to raise testosterone, and some lowered it. People who trained while taking them gained the same muscle and strength as with a placebo. 13 of 50 products exceeded the daily upper limit for ingredients like zinc. The same money is better spent on protein and training.