The "Wolverine stack": what the nickname means and what is actually in the vial

A nickname, not a chemical name#

"Wolverine stack" is forum shorthand for a combination of two synthetic peptides, BPC-157 and TB-500, usually sold together as an equal-parts blend in a single vial: for example 5 mg of each in one 10 mg vial. The name is a marketing label borrowed from a comic-book character. It does not appear in any chemical database, on any laboratory report or in any regulatory record, and two vendors using the same nickname can be selling different quantities, ratios or grades.

Because the phrase has no fixed definition, the only way to know what a listing contains is to read the listing: the name of each component, the stated amount of each, and the certificate for the lot. The nickname also travels: it is used for the equal-parts blend most often, but it has been attached to listings with other ratios and to listings that bundle two separate vials rather than one.

What the two components are#

• BPC-157 is a synthetic peptide of 15 amino acids whose sequence is derived from a protein found in gastric juice.^[1]
• TB-500 is a synthetic peptide fragment related to thymosin beta-4, a naturally occurring 43-amino-acid protein.^[2]

That is as far as this page goes. Both are sold for laboratory research only, and nothing here describes what either compound does, in any system.

Why the ratio and the total milligrams matter#

Two listings that both say "Wolverine" can differ in three ways that the nickname hides.

• Total content. A "5/5" vial holds 10 mg of peptide in total; a "10/10" vial holds 20 mg. They are different products, and the second is not simply a larger version of the first unless the ratio is also the same.
• Ratio. Most listings are equal parts, but not all. A listing that does not state the amount of each component separately has not told you the ratio.
• Price per milligram. The honest comparison across vendors is price divided by total stated milligrams, with the ratio held equal. A lower sticker price on a smaller vial is not a lower price.

The same arithmetic applies to any blend. A listing that states only a brand name and a price has left out the two numbers you need. If a vendor cannot tell you the amount of each component, it is also unlikely to have a certificate that reports them, which is the next thing to check.

What a certificate for a blend should show#

A certificate of analysis for a single peptide reports identity and purity for one compound. A certificate for a two-peptide blend has to do more, and a certificate that reports only one purity figure for "the blend" has not characterised it.

• Identity of both components, each confirmed separately, normally by mass spectrometry.
• Purity for each component rather than a single number for the mixture, where the laboratory’s method separates the two.
• Quantity of each component where the laboratory reports it, so that the stated ratio can be checked against the vial.
• The lot number, matching the one printed on the vial, and the laboratory’s name and test date.

Our guide to reading a certificate of analysis explains each of those fields; the supplier checklist covers how to verify them.

How Renuvia Labs lists this combination#

Renuvia Labs lists this combination under its component names, as BPC-157 + TB-500 Blend 10 mg: an equal-parts blend of 5 mg and 5 mg in one lyophilized vial. The product name is the component names; the nickname appears on the listing only as a synonym so that searches for it land on the right page. Since October 30, 2026 each component is also listed on its own, as BPC-157 10 mg and TB-500 10 mg. The certificate for each lot is listed in the COA library and reads "pending" until the laboratory report exists.