Add your bottles
Search the NIH label database, scan a barcode, or type a product by hand. Connect Apple Health when you want Impact.
Waitlist open · US first
Know what you take.
See what overlaps, what it costs, and how your sleep and HRV look before and after you start a bottle.
Educational log only. Not medical advice.
How it works
Built around the bottles you already buy and the wearable days already on your phone.
Audit overlaps and spend
See shared ingredients across bottles, estimated monthly cost from the labels, and a dose score from daily totals.
Compare before and after
Impact lines up 21 days before a start date with 21 days after, for deep sleep, HRV, and resting heart rate.
Impact
See the weeks before and after.
Pick a supplement start date. Impact compares deep sleep, HRV (SDNN), and resting heart rate in the 21 days before with the 21 days after, using days from Apple Health.
Those numbers are association only, not causation. They describe your logged data. They are not proof that a bottle changed anything, and they are not advice to start or stop.
- Deep sleep for the after window, with the change versus the weeks before
- HRV and resting heart rate from the same before and after days
- A deep sleep chart across the window, with optional Pro notes for training, alcohol, and travel
What you get
Audit your bottles, see Impact, log each day, and browse stacks others share.
Dose audit
Daily totals from your labels, with a score based on doses and overlaps.
Overlap spend
See where the same ingredient is paid for in more than one bottle, and what that costs each month.
Impact
Compare deep sleep, HRV, and resting heart rate for the 21 days before a start date with the 21 days after. Association only, not causation.
Daily logging
Mark what you took today and keep a quiet history you can reopen later.
Share and Discover
Publish a stack with a link, copy someone else's, and filter Discover by goals like Longevity.
Join the waitlist
Leave your email and we will invite you when Stack opens in the US.
Questions
Is this medical advice?
No. Stack is an educational log. It is not a medical device and it does not calculate a dose for you.
What does Impact show?
For a chosen supplement start date, Impact compares deep sleep, HRV (SDNN), and resting heart rate across 21 days before and 21 days after, using wearable days from Apple Health. It is labeled as association only, not causation, and it does not tell you to start or stop anything.
What does the audit cover?
Overlapping ingredients across bottles, estimated monthly spend from the labels you enter, and a dose score from daily totals and overlaps.
Can I share a stack?
Yes. You can publish a shareable stack, copy one into your own list, and browse Discover with goal filters such as Longevity.
When does it launch?
We are opening the waitlist first, with a US focus. Join above and we will email you when access is ready.