Peptide Vial Sizes Explained: What "10mg" Means and Why the Vial Is Bigger
A peptide vial has two sizes: the amount of peptide on the label, in milligrams, and the volume of the glass vial, in millilitres. Buyers often mix them up. This post explains both, why a vial can look almost empty, and lists the sizes we sell.
Research blog: general laboratory-science and literature context. Not medical advice. Sealed Peptides materials are for laboratory research use only, and are not for human or veterinary use.
Two different numbers
The label amount, such as 10 mg, is the mass of material in the vial. The vial itself is a small glass container, commonly a few millilitres in volume, closed with a Stopper and crimp cap. The volume of the glass says nothing about how much peptide is inside; it only has to leave room for a solvent later and some Headspace.
Why a vial can look nearly empty
Ten milligrams of freeze-dried powder is a very small amount. After lyophilization it may form a thin Cake at the bottom, a loose powder, or a film on the glass, especially after shipping. Larger amounts such as 500 mg of NAD+ are clearly visible; small peptide amounts often are not.
Label amount vs net peptide
The labeled mass usually refers to the material as supplied. Lyophilized peptides also contain counter-ions and residual water, so the Net peptide content is lower than the gross weight. Our guide on purity vs net peptide content explains the difference.
Vial sizes we list
- Retatrutide: 10, 30, 60 and 100 mg (product page).
- Tirzepatide: 60 and 120 mg (product page).
- NAD+: 500 and 1000 mg (product page).
- Single-size items: every other compound is listed in one size, shown in its name and on the printable price list.
Choosing a size
Larger vials almost always cost less per mg, and volume pricing lowers the price of multiple vials of one size. Compare options with the price per mg calculator; solution arithmetic for any vial size is in the reconstitution calculator and the free Peptide Lab Handbook.
Terms used in this guide
Related tools and guides
For laboratory research use only. Not for human or veterinary use. This post is general chemistry and literature context and does not describe or endorse any use of Sealed Peptides products.
