Test Booster · head-to-head
Stak vs Prime Male
Test Booster head-to-head, graded on doses and price
by Animal
F
A
Formula · Deal
by Roar Ambition
C
B
Formula · Deal
Our pick
Our pick: Prime Male — better formula on the numbers.
Side by side
| Stak | Prime Male |
|---|
| Formula grade | F | C |
|---|
| Deal grade | A | B |
|---|
| Price | $48.00 / 21 srv | $75.00 / 30 srv |
|---|
| Per serving | $2.29 | $2.50 |
|---|
| DIY bulk cost/serving | $0.86 | $0.55 |
|---|
| Markup over DIY | 2.6× | 4.5× |
|---|
| Ingredients at clinical dose | 1 of 10 | 2 of 7 |
|---|
| Bottom line | Skip it | Worth it |
|---|
Stak verdict
The maximalist version of the blend trick: five named "complexes" — Pro Testosterone, Growth Hormone Support, Aromatase Combating, Hormone Amplifying, Restorative — hide ~20 ingredients behind five total numbers, so you can't verify a single dose. The two ideas underneath are both dated: the "Pro Testosterone" blend is built on tribulus, the single most-studied T-herb and the one most consistently shown to do nothing for testosterone; the 1,500mg "Growth Hormone Support" is just amino acids (arginine, lysine, glutamine, glycine, ornithine) reviving the debunked 90s idea that oral aminos spike GH. What's disclosed — magnesium and zinc — is the cheap, poorly-absorbed oxide form. Cult brand, nostalgia pricing, hidden everything.
Prime Male verdict
The honest one of the bunch — and it grades better because it doesn't play the 'equivalent' game. Real 300mg KSM-66, real 120mg ginseng, real 1,600mg D-aspartic acid, solid zinc and vitamin D. Several are still under their studied dose (the ashwagandha and ginseng are half), but these are actual amounts, not raw-herb inflation. It's a fair formula sold at a premium; the same actives cost a fraction bought loose.
Full Stak review →
Full Prime Male review →
More Test Booster grades
Educational only — not medical advice. Grades and clinical doses are computed from public labels against sourced research (citations on the main site); prices last verified 2026-07-30. Expensive Powder has no sponsors; bulk links may earn an affiliate commission, which never affects a grade. Talk to a clinician before starting any supplement.