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P21 5 mg price

19 sellers, $12.0 to $25.6 per milligram, median $22.2, read 2026-09-26.

Preclinical. Animals or cells only among the studies cited here. No human study on this page. 5 animal studies, no human study.7 reported

Some seller links may pay this site when you buy through them. A payment never changes a seller's tier or rank, and no seller has a say in any page.

VialAll sizes 365 mg 1910 mg 1112 mg 150 mg 1100 mg 2

Best value with a certificate: Nationwide Peptides, $97.0 for 5 mg, $19.4 per mg. Cheapest of all: Peptides.com at $12.0 per mg for 5 mg, tier B. P21 5 mg median is $22.2 per mg across 19 sellers.

#7 of 20 · 5 mg vial

greyresearchpeptides.com

C
$60.0$12.0 /mg

46% below the 5 mg median

Storefront not yet profiled

View P21 greyresearchpeptides.com

#8 of 20 · 5 mg vial

generalpeptides.com

C
$97.0$19.4 /mg

13% below the 5 mg median

Storefront not yet profiled

View P21 generalpeptides.com

#9 of 20 · 5 mg vial

Limitless Biotech ST
C
$97.0$19.4 /mg

13% below the 5 mg median

Site says it tests; no certificate could be found

View P21 limitlesslifenootropics.st

#10 of 20 · 5 mg vial

nationalsciencelabs.co

C
$97.0$19.4 /mg

13% below the 5 mg median

Storefront not yet profiled

View P21 nationalsciencelabs.co

#11 of 20 · 5 mg vial

corepeptidesofficial.com

C
$110$22.0 /mg

1% below the 5 mg median

Storefront not yet profiled

View P21 corepeptidesofficial.com

#12 of 20 · 5 mg vial

Huaian Hanyou Peptide
C
$112$22.4 /mg

1% above the 5 mg median

Site says it tests; no certificate could be found

View P21 huaianhanyoupeptides.com

#13 of 20 · 5 mg vial

Lejian Biotech Peptide
C
$112$22.4 /mg

1% above the 5 mg median

Site says it tests; no certificate could be found

View P21 lejianbiotechpeptides.com

#14 of 20 · 5 mg vial

MJA Peptides
C
$112$22.4 /mg

1% above the 5 mg median

No testing claim and no certificate found

View P21 mjapeptides.com

#15 of 20 · 5 mg vial

ZL Peptides
C
$112$22.4 /mg

1% above the 5 mg median

No testing claim and no certificate found

View P21 zlpeptides.com

#16 of 20 · 5 mg vial

Limitless Biotech ST
C
$116$23.2 /mg

5% above the 5 mg median

Site says it tests; no certificate could be found

View P21 limitlesslifenootropics.st

#17 of 20 · 5 mg vial

Peptide Science LLC
C
$120$24.0 /mg

8% above the 5 mg median

Site says it tests; the certificates sit behind a login or a bot wall and none could be read

View P21 peptidesciencellc.com

#18 of 20 · 5 mg vial

purepeptidefactory.com

C
$120$24.0 /mg

8% above the 5 mg median

Storefront not yet profiled

View P21 purepeptidefactory.com

#19 of 20 · 5 mg vial

USA Peptide Sciences
C
$120$24.0 /mg

8% above the 5 mg median

Site says it tests; no certificate could be found

View P21 usa-peptidesciences.com

#20 of 20 · 5 mg vial

Limitless Bio-Tech
C
$128$25.6 /mg

15% above the 5 mg median

Site says it tests; no certificate could be found

View P21 limitlessbiotech.us

20 of 20 offers at 5 mg, sorted tier first, then price per mg.

Week by week

P21 5 mg was first read on 2026-09-26. Median $22.2 per milligram across 19 sellers. A week-by-week line appears after the next finished weekly walk. One week is a snapshot, not a history.

The figure is the same ungated market median the range on this page uses: every seller found. Certificate tier still ranks the cards. The purity gate is written and off, so this is not a tested-sellers-only series.

We never charge for knowledge. No vendor has a say in what a page says. Sellers are ranked by the certificate they publish, then by price. Every size of P21 · Laboratories named