P21 Peptide Peptides 021

P21 Peptide


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80 in stock (can be backordered)

Quantity discounts
1 $99.99
2-9 $96.99
10-19 $93.99
20+ $89.99

3rd Party Tested
All of our products and batches are analyzed and tested by independent 3rd party laboratories for purity and quality assurance.

Delivery Guarantee
We guarantee the safe arrival of your package. If for any reason your package doesn’t arrive, please contact us and we will work with you to ensure you get your products in a timely fashion.

Lyophilized Powder
Lyophilization is defined as a freeze-drying process that removes water from a product after it is frozen and placed under a vacuum.

USA > $150
U.S. orders over $150 ship free, usually within one to two business days.

Discreet Shipping
All items are discreetly shipped in order to protect the privacy of our customers.

P21 is a potent cyclin-dependent kinase inhibitor (CKI). The p21 (CIP1/WAF1) protein binds to and inhibits the activity of cyclinCDK2, –CDK1, and –CDK4/6 complexes, and thus functions as a regulator of cell cycle progression at G1 and S phase. The binding of p21 to CDK complexes occurs through p21’s N-terminal domain, which is homologous to the other CIP/KIP CDK inhibitors p27 and p57. Specifically it contains a Cy1 motif in the N-terminal half, and weaker Cy2 motif in the C-terminal domain that allow it to bind CDK in a region that blocks its ability to complex with cyclins and thus prevent CDK activation.

For more research information, please visit the following Wikipedia article.

CAS Number


Appearance Lyophilized Powder
Synonyms CDKN1A, CAP20, CDKN1, CIP1, MDA-6, P21, SDI1, WAF1, p21CIP1, cyclin-dependent kinase inhibitor 1A, cyclin dependent kinase inhibitor 1A
Molecular Formula C20H18ClF6N3O2
Molecular Weight 481.82 g/mol

Important Information About This Research Product:

  1. Your vials are not empty. The product is at the bottom of the vial.
  2. All peptides come in a lyophilized (freeze-dried) powder, that must be reconstituted with bacteriostatic water (this is not something that we carry).
  3. Store all products in a dry, cool, and dark place away from UV rays. For best preservation, store @ 4°C.
  4. All products purchased are for laboratory & research use ONLY, this means we cannot provide any further instructions on reconstitution and/or dosing.

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1 review for P21 Peptide

5.0 Rating
1-1 of 1 review
  1. Haven’t seen this product on too many competitors sites so i decided to try this company’s P21 and to say i was impressed is an understatement.

    Customer Service was very responsive, even on Sunday night when i had a question about my order, and the product itself has yielded exceptional results in my research!

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