Evidence-Led Nutritional Science
The right dose, on the record.
Every Eastbrook formula is built from published research and lists every active — and its exact amount — right on the label. No blends, no mystery doses. Bottled in the USA.
Made in the USA
180-Day Guarantee
GMP-Registered Facility
Made in the USA
Every batch, domestic
FDA-Registered Facility
GMP production standards
180-Day Guarantee
Six months to decide*
Secure Checkout
Encrypted end to end
*Subject to refund policy conditions
The range
Choose your focus
One focused formula per goal. Start with what matters most — or browse all 14.
Weight ManagementFormulas for metabolic balanceExplore →Men's HealthDrive, T-support & prostate careExplore →Sleep & StressWind-down & deeper restExplore →Brain & FocusSharper focus & recallExplore →Gut & DigestionMicrobiome & digestive comfortExplore →Energy & LongevityCellular energy & staminaExplore →
In the Spotlight
The formulas our customers reorder most — every amount on the record.
How we work
Formulas you can fact-check.
Supplement labels are famous for hiding behind "proprietary blends." Eastbrook Research was set up to do the opposite: we publish the exact amount of every active in every formula, so you can hold the label up against the research yourself before you spend a dollar.*
Evidence before ingredients
An active earns its place by what the research shows — not by what sells.
Numbers on the record
Exact milligram amounts published on every label — nothing tucked into a blend.
Accountable manufacturing
USA-made in a GMP-registered, FDA-registered facility, batch after batch.
What we stand on
Read it before you buy it
A supplement should survive scrutiny. Ours are built so you can check the label against the evidence yourself.
Built from the literature
Each formula starts as a reading list. Actives make the cut on evidence, and the dose follows the studies — not the marketing budget.
Every number disclosed
Exact per-serving amounts for every active, printed on the bottle and repeated in full on each product page.
US production, checked twice
GMP-registered, FDA-registered US facility, and every batch reconciled against its printed label before it ships.
Six months to judge
Use any formula for up to 180 days. If the results don't justify the price, ask for your money back — opened bottles qualify.
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. FDA registration does not imply FDA approval.
Accepted Payment Methods
Trusted Shipping Partners
Before you ask
Straight answers
Can I see exactly what’s in each formula?
Yes — that’s the point of Eastbrook. The label and the Supplement Facts on every product page list each active with its precise amount. We never use proprietary blends, so there is nothing to hide behind.
What’s your relationship with the FDA?
Dietary supplements are not FDA-approved — that’s true of every brand in the category. What we can tell you: our formulas are produced in an FDA-registered, GMP-registered facility. Registration is not approval, and we won’t pretend otherwise.
Where do you manufacture?
All production runs in the United States, inside a GMP-registered facility, with each batch checked against the printed label before release.
How does the 180-day guarantee work?
You get a full 180 days — roughly six months — to decide. If a formula didn’t earn its place on your shelf, write to us and we’ll refund you, opened bottles included. Details in the Refund Policy.
Is this a subscription?
No. Every order is a one-time purchase — nothing recurs. The 3- and 6-bottle options simply lower the per-bottle price.
180-Day Money-Back Guarantee
Put a formula on trial — 180 days, your verdict
Every bottle earns its keep or comes off your bill. Reach us any time within 180 days for a refund — empty bottles included.*
*Subject to refund policy conditions. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.