Prime-T is a testosterone booster supplement made by RSP Nutrition.

It’s designed to improve strength and body composition through increases in testosterone levels.

RSP Nutrition was founded in 2009, in the United States.

Ingredients Label

Active Ingredients

Vitamin D

Vitamin D is a vitamin that is primarily made by the body when exposed to sunlight.

It has a bunch of positive effects on health, including increases in testosterone when taken over several weeks (1).

Zinc

Zinc is an important mineral which is often depleted quickly in athletes, usually via sweat.

It’s been shown to improve testosterone levels in those who are zinc-deficient (2).

D-Aspartic Acid

D-Aspartic acid is an amino acid which has shown good evidence for raising testosterone levels.

These increases only last for a short time, usually returning to normal after around 30 days in healthy males (3).

The effective daily dose is 2000-3000mg.

Fenugreek

Fenugreek is a plant that’s been shown to increase libido, but has shown mixed results for boosting testosterone levels (4, 5).

An effective dose is around 500mg.

Maca

Maca is a vegetable with aphrodisiac effects.

It’s been shown by research to raise libido, however it doesn’t have any significant effects on testosterone (6).

An effective dose is about 1,500-3,000mg.

DIM

Diindolylmethane, or DIM, is a compound that’s abundant in broccoli and some other vegetables.

Studies show that it has anti-oestorogen effects, which can result in free testosterone levels (7).

Safed Musli

Safed Musli is a herb which is recognised as an aphrodisiac in Indian medicine.

Research to date has only been done in rats. These studies show increases in libido, but have not yet examined influences on testosterone (8).

Boron

Boron is a mineral has shown evidence for being able to boost free testosterone levels (9).

Doses used in studies is between 3-10mg.

Who Takes It?

Male athletes of older age, or those with below-average natural testosterone levels will benefit most from using Prime-T.

How to Take

Take 4 tablets on an empty stomach, 30-60 minutes before bed time.

Side Effects

May increase libido and alter general mood.

Pros

Works through multiple mechanisms
Effective doses of most ingredients
Improves libido.

Cons

Some of the ingredients are not included in effective doses
Some ingredients have been shown to not have any effect on testosterone.

Conclusion

Prime-T is a good testosterone boosting formula which works through a whole bunch of ways.

It includes ingredients that address mineral and vitamin deficiencies, reduce oestrogen levels, and boost testosterone directly.

Some of the ingredients aren’t included in the effective doses, and some do nothing aside from increase libido, however there are plenty of inclusions in each serving that should have excellent effects.

You’ll benefit most from this product if you’re an older male, or have abnormally low testosterone levels.