Peptide blends explained: reading the label and keeping records
Updated 2026-10-15 · The Pep Planner
Some vials contain more than one peptide. Blends are convenient but easy to log wrong. Here is how to read the label and keep clean records.
What a blend is
A blend is a single vial that contains two or more peptides in a set ratio. Some are sold under a brand-style name instead of listing the parts on the front, so check the label or product page for what is inside.
Reading a blend label
- Each part and its amount, for example 10 mg + 10 mg
- The total amount in the vial
- The lot number, which should match the blend's COA
- A COA that tests each part, not just the total
Why blends need their own records
Every unit drawn from a mixed blend contains all of its parts in the same ratio. If you log it as just one of its parts, your history and stock counts will be off. Track the blend as its own item and note what it contains.
Mixing math for blends
Work from the total amount in the vial, then split it by each part’s share. For example, a 10 mg + 10 mg blend mixed with 2 mL of liquid holds 5 mg of each part per mL.
How The Pep Planner handles it
Add the blend to your stockpile as one item with its parts in the name or notes. The reconstitution calculator works from the total amount in the vial, and protocols linked to the blend count down that vial rather than the individual parts.
Common questions
Is a blend the same as mixing two vials together?
Not quite. A blend is made by the vendor and should have its own COA. If you combine separate vials yourself, record each vial you used and the date.
Do you recommend specific blends?
No. The Pep Planner is an organizer and tracker and does not recommend compounds or amounts.
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More guides
- What is a peptide? A plain-English guide
- How to read a certificate of analysis (COA)
- Peptide storage basics: sealed vs. mixed vials
- What is a GLP-1? Single, dual and triple agonists explained
- How to organize vial inventory (without a spreadsheet)
- Spreadsheet vs. planner app for tracking a research protocol
- How to plan a step-up (phased) protocol schedule
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