How Much Do Peptides Cost? Real Prices From 2,500 Listings

Peptide prices are quoted per vial, and per vial is the least useful unit imaginable. A $60 vial and a $95 vial tell you nothing until you know they hold 5 mg and 20 mg respectively — at which point the $95 vial is less than half the price.

The figures below are calculated from live vendor listings tracked by Peptide Library, normalised to price per milligram. They are what the market actually charges, not estimates.

Price per milligram, by peptide

What the spread tells you

The gap between the low and high columns is the real finding. Across most of these compounds the 90th percentile is three to four times the 10th — for the same molecule, at the same nominal purity.

• Semaglutide runs $4.43 to $25.00 per mg. A 5.6× spread. This is the widest of the metabolic peptides and reflects both vial-size variation and vendors pricing against pharmacy comparisons rather than against each other.

• GHK-Cu is the cheapest per milligram by a wide margin. Median $0.80. That is a function of vial size — GHK-Cu ships in 50–100 mg vials where most peptides ship in 5–10 mg, so the per-milligram figure falls even when the per-vial price is similar.

• Cagrilintide is the most expensive at a $13.25 median. It is the newest compound in the table and the one with the thinnest supply, which is the usual pattern.

• NAD+ at $0.16 per mg is not comparable to the rest. It is dosed in hundreds of milligrams, so a low per-milligram price does not make it cheap per use.

Why per-vial pricing misleads

Two listings for the same peptide, both real:

Listing A looks like the budget option and costs more than twice as much. This is the single most common pricing error, and it is why the vendor comparison normalises everything to price per milligram before ranking.

What drives the price differences

1. Vial size. The dominant factor. Larger vials are almost always cheaper per milligram, and are also why a “cheap” peptide may be one you cannot use efficiently.

2. Testing depth. A vendor publishing batch-specific HPLC and mass spectrometry is paying for it. That cost is real and shows up in price. See the COA guide.

3. Synthesis difficulty. Longer sequences cost more to make. A 39-residue peptide is not priced like a tripeptide.

4. Supply maturity. Newer compounds carry a premium that erodes as more suppliers enter.

5. Bulk and subscription discounts. Frequently 15–30%, which is comparable to the entire spread between mid-market vendors.

What cheap should make you check

A listing well below the 10th percentile is not automatically fraudulent, but it is a reason to look at four things:

• Stated vial size versus the actual COA. Underfilled vials are the most common way to appear cheap.

• Whether a COA exists at all, and whether it is batch-specific or a single document reused across every product.

• Whether the peptide is what it claims. Mass spectrometry confirms identity; an HPLC purity figure alone does not.

• Whether it is a blend sold as a single compound, which lowers the apparent per-milligram price of the headline ingredient.

Costs beyond the vial

These are small next to the peptides but not zero, and the free-shipping threshold in particular changes which vendor is cheapest for a small order.