What is a peptide blend? How to read blend labels and COAs

The short answer

A peptide blend is a product that combines two or more peptides in one container, such as BPC-157 with TB-500, at amounts chosen by the manufacturer. To understand one, read three numbers: the mg of each compound, the total mg, and, for a solution, the volume that gives each compound's mg per ml. A blend is only as well defined as its certificate, which should confirm the identity and amount of every component, not just the mixture as a whole.

Reading the label: what 10/10 means

Blend labels often use shorthand. A label reading BPC-157/TB-500 10/10 means 10mg of BPC-157 and 10mg of TB-500 in the same container, 20mg in total. A three-part label such as 50/10/10 lists three compounds in the order named on the label. If the label only gives a total, for example 70mg, the split between compounds is unknown unless it is stated elsewhere.

The order matters. 10/5 and 5/10 are different products, so check which compound each number refers to.

Total mg vs per-compound mg vs mg per ml

Total mg is the least useful figure on its own. Two blends both labelled 105mg could be 75/15/15 or 35/35/35, which are very different products. Per-compound mg is the minimum a buyer needs.

For a product supplied in solution, mg per ml is the figure that defines it, because the concentration is fixed. The Celyfe WOLVERINE pen, for example, holds 15mg of BPC-157 and 15mg of TB-500 in 3ml, so each is present at 5mg per ml and the total is 10mg per ml. For a lyophilised vial, the concentration depends on how much diluent the laboratory adds, so the label can only state the mass.

Why ratios differ between sellers

No pharmacopoeia or regulator publishes a standard composition for research blends such as GLOW, KLOW or WOLVERINE. The names grew up in the market, and each manufacturer chooses its own amounts. A GLOW vial is commonly sold as 50mg GHK-Cu with 10mg each of BPC-157 and TB-500, while the Celyfe GLOW pen holds 75mg, 15mg and 15mg.

Ratios are shaped by practical factors: convention, the relative cost of each compound, how well the mixture dissolves, and, for solutions, how much of each compound the formulation can hold at a stable concentration. None of these makes one ratio correct; they make products with the same name non-interchangeable.

What a COA must show for a blend

A certificate of analysis for a single peptide confirms identity, usually by mass spectrometry, and purity, usually by HPLC. A blend needs the same evidence for every component. Because HPLC separates compounds that elute at different times, a laboratory can report each peptide separately in one run or in separate methods.

• Each component is named and identified, so you can see that every compound on the label is actually present.
• Each component is quantified, as mg or as a percentage of the labelled amount, so the ratio can be checked against the label.
• Purity is reported per component, not only as one figure for the whole mixture.
• The batch number matches the batch printed on your vial or cartridge.
• The laboratory, the method and the report date are stated, so the certificate can be checked with the lab.

Blend vs separate single compounds

A blend is a convenience format: one container, one label and one certificate instead of several. The trade-off is flexibility. In a blend the ratio is fixed by the manufacturer, so a study that needs to vary one compound independently of another, or to compare each compound on its own, is better served by single-compound products.

Blends also need more analytical work to verify, because every component has to be identified and quantified in the same mixture. When a supplier publishes a blend certificate that does this, the convenience of the format does not come at the cost of documentation.

Red flags on blend products

Be cautious when a blend is sold with only a total mg, when the certificate gives one purity figure for the mixture, when the certificate shows a different composition or batch from the label, or when the same certificate appears across several products or several years. A certificate that cannot be traced to a named laboratory adds little.

Where Celyfe fits

Celyfe states the mg of every component and the cartridge volume for each pen, so the mg per ml is known before ordering. The WOLVERINE certificate for batch C26071 (Analiza Bialek, Wroclaw, HPLC, dated 2 October 2026) reports 99% purity. GLOW and KLOW certificates are being re-issued and will be listed in the COA library at /coa when published. All pens are shipped cold-chain and stored at 2 to 8 °C (do not freeze).

Sources

• Resident. The GLOW Peptide Blend: Why Everyone Is Searching for It, and What the Science Says. 25 September 2026 (typical 50, 10 and 10mg GLOW vial).
• Manning MC, Chou DK, Murphy BM et al. Stability of protein pharmaceuticals: an update. Pharmaceutical Research, April 2010. PMID 20143256 (analytical methods and degradation pathways).

Research use only

Celyfe supplies research peptides for laboratory and research use only. Nothing on this page is guidance on use in humans or animals.