Most Supplement Users See Little to No Effect.
The average supplement user spends €2,000+ per year. Research suggests most are seeing little to no measurable effect from the majority of what they take.
of best-sellers in one supplement category on Amazon contained little to no active ingredient.
products in another popular category actually contained what the label promised.
the number of supplements the FDA tests before they hit shelves.
Estimated wasted per year
That's for supplements you haven't tested, from brands you haven't verified, based on advice from people who don't know you.
Know Your Stack in 60 Seconds
The moment you add your supplements, BioStackr analyses your stack and shows you:
Your exact spend
Monthly and annual spend on supplements. Most users are surprised.
Clinical backing
Which supplements have strong clinical backing — and which have almost none.
Ranked by cost
By cost and uncertainty. We tell you where to focus so you stop guessing.
Some Supplements Work.Many Don't.
Your magnesium. Six months. $174. Not a single measurable effect.
Vitamin D3
5000 IU Daily
Compatibility
Reliable. Shows up. Your energy scores are 23% better since you committed.
Magnesium Glycinate
400mg Before Bed
Compatibility
Six months and your recovery hasn't budged. This one's coasting.
Ashwagandha
600mg Morning
Compatibility
Stress is lower, but your energy dipped. Worth investigating.
Fish Oil
2000mg Daily
Compatibility
Quiet but consistent. Recovery up. The strong, silent type.
Test One Supplement. Or Your Whole Stack.
Your data. Your biology. Real answers.
Add your supplements.
Upload your Apple Health, WHOOP or Oura data — or check in at your own pace. Sleep, energy, mood, focus.
Using your existing health data? Insights can come faster than you'd expect.
Flag unusual days (illness, travel, stress) so they don't skew your results.
Compare your health on days WITH a supplement vs days WITHOUT.
Filter out noise — stress, alcohol, bad nights excluded automatically.
Run the same statistical methods used in clinical trials.
KEEP — measurable positive effect. Worth your money.
DROP — no effect. Stop paying for it.
TESTING — signal forming. Needs more data.
No opinions. No influencers. Just your data.
What Users Discover
"I had no idea I was spending €220/month."
"Magnesium was doing absolutely nothing for my sleep."
"Fish oil is the only one worth keeping."
Stories from real users — based on their data, their body, their supplements.
The Honeymoon Is Over.
Because 'I think it's working' isn't evidence.
Dropped 4 supplements. Saving €90/month. Should've done this years ago.
— Marcus T., saving €90/month
From 12 bottles to 3 that actually moved the needle. Same results, less clutter.
— Jen, dropped 9 supplements
Thought it was all guesswork. Only one thing really helped.
— @biohack_ben, Whoop user
Same ingredient, two brands. One made a difference, one didn't. Now I know which to keep.
— Sophie K., tested 2 brands
Less really is more. Fewer pills, clearer routine.
— David, simplified his stack
HRV steadier on the nights I take it. Fewer 3am crashes.
— ER nurse, nights
I stopped guessing. Now I know what's worth paying for.
— Alex P.
After years of trying everything, I finally reset to what works.
— Priya, back to basics