Brand reviews
Who you buy from matters as much as what you buy.
Two brands can sell the same compound at the same stated purity and be nothing alike underneath. Testing, transparency, what happens when an order goes wrong: all of it differs. So we check the claims one at a time, and say which ones we couldn't confirm.
Side by side, on the things that actually differ
| BioLongevity Labs | Limitless Biotech | |
|---|---|---|
| Catalog size | 150+ compounds | 90+ compounds |
| Public pricing | Full retail pricing on every product page, with quantity discounts at 3, 6, and 9 units applied automatically. | Hidden. |
| Ships from | United States | United States, ships worldwide |
| Returns window | Generally not accepted once shipped, with an exception for orders shipped incorrectly. | 10 days from delivery to submit a request through a separate returns portal, reviewed within 24 to 48 business hours. |
| Claims we verified | 2 of 5 | 1 of 3 |
Every product we reference, from both brands
Links go straight to each vendor's own product page. None of them are affiliate links. We don't get paid if you click.
$99.97
$164.97
$84.97
$274.97
$259.97
$129.97
$94.97
$109.97
$99.97
$99.97
$79.97
$55.97
Peptide vendor questions we get asked
Each link goes to the review or guide that answers it directly.
How we review a supplement or peptide brand
Every brand review on this site follows the same sequence. We read the vendor's own quality statement, testing claims and policies, then we try to verify each claim independently. A Certificate of Analysis we can open before buying counts as confirmed. A statement that three unnamed laboratories test every batch does not, however plausible it sounds.
That split is why the reviews carry a verified count. Our BioLongevity Labs review confirms 2 of 5 quality claims, mostly on the strength of a public COA database and open pricing. The Limitless Biotech review, covering the company previously trading as Limitless Life Nootropics, confirms 1 of 3, with batch-level purity, sterility and endotoxin documents as the standout.
What third party tested actually means
Almost every research peptide vendor claims third party testing. The phrase only means something when you can see the report, know which laboratory produced it, and match it to the batch you were sent. Our guide on how to vet a peptide vendor walks through the seven checks in order, and the BPC-157 vs TB-500 comparison shows how the same documentation gap plays out across two compounds people usually buy together.