Peptide stacking: the math for two peptides
On a U-100 insulin syringe, learn the math for peptide stacking with either pre-mixed blend vials or separate vials.
Only for reference. Dose settings come from your prescriber or from the product label. This tool converts the numbers you type.
- on a U-100 syringe, the amount in 1 unit
- 0.01 mL
- for 100 units
- 1 mL
- per 1 mg
- 1,000 mcg
Peptide stacking involves 2 or more peptides used in a routine. They may come from a pre-mixed blend vial, or they may come from separate bottles. Our guide covers only syringe math for measuring liquid accurately; we don't give dose advice or make any benefit claims. Ask your clinic or pharmacist about combining compounds. Your prescriber always makes the dose decisions.
Peptide stacking math: a blend vial
Inside a single bottle, a blend vial holds 2 peptides combined in 1 dry powder cake. Blends of BPC-157 and TB-500 are sold by vendors in 10 and 20 mg vials. Vendors also sell CJC-1295 with ipamorelin blends in sizes from 5 to 55 mg. Each peptide's share appears on the vial label; once the powders are mixed, that ratio can't be changed.
Picture a blend label for a hypothetical 10 mg product that shows 5 mg of each peptide, with you adding 2 mL of bacteriostatic water. After mixing, each 1 mL holds the first peptide at 2.5 mg and the second at 2.5 mg.
A U-100 syringe has 100 units for 1 mL. Drawing 10 units provides 0.1 mL, which delivers 0.25 mg of each peptide. When you enter 1 ingredient's mg weight, our peptide reconstitution calculator and BPC-157 calculator can work out single-compound numbers.
Two vials, kept separate
Your 2 separate vials call for 2 calculations and 2 draws in total. Adding bacteriostatic water to dry powder is reconstitution; each bottle relies only on its own mg weight and the volume of water.
To find the unit mark for your first vial, use our peptide dosage calculator or peptide dosing chart. Work out the second vial in a separate calculation. Your total injected liquid volume is just the sum of the 2 unit counts. If you intend to draw both into 1 barrel, make sure the combined units fit within a 30, 50 or 100 unit syringe.
Combining two peptides in a single syringe
Should you draw liquid from 2 vials and place it in 1 syringe barrel? That clinical question belongs with your prescriber or pharmacist. According to the Hospira Bacteriostatic Water for Injection label, some drugs may be incompatible with benzyl alcohol. It also advises consulting a pharmacist.
Different peptides may also react inside the barrel. Never mix the liquids unless a pharmacist confirms that they remain stable. With 2 fresh syringes, a thin needle won't dull on 2 rubber stoppers. You also avoid carrying liquid from 1 vial into another.
Track each vial
Handling more than 1 bottle together calls for careful labeling so you don't mix up concentrations or expiration dates. The label on bacteriostatic water asks for aseptic technique. That means clean, germ-free steps, such as wiping each stopper with alcohol every time you enter.
Once you open or puncture any multiple-dose vial with a needle, you must date it, according to the CDC injection safety guidance. Unless the manufacturer lists another timeframe, discard punctured vials by 28 days. Never use a vial after the expiration date printed by the manufacturer.
Questions people often ask
How do I calculate units for a blend of peptides?
The blend label gives an mg amount for 1 individual peptide; use that, not the combined total mg on the front. Input the mg for that peptide along with your water mL; drawing the unit mark automatically includes the second peptide's matching share.
Can I combine two peptides in one syringe?
Before you combine 2 vials in 1 syringe, ask your prescriber or pharmacist. Different solutions can be incompatible when mixed. A sterile syringe for each vial helps protect the needle tip from dulling and blocks cross-contamination between bottles.
Do peptide stacks have FDA-approved status?
No. Compounds often found in stacks, including BPC-157, TB-500, CJC-1295 and ipamorelin, aren't FDA-approved for any use in people. These compounds are sold by vendors as unapproved research chemicals. They have neither an official FDA label nor dosing instructions.