Buying Guide — 2026-10-06
The Reta 20mg vial is the size researchers reach for when a protocol will run longer or reach higher amounts — it holds twice the peptide of a 10mg vial and gives the best cost-per-mg. But the same buying rules apply: only order from a source that can prove purity with batch-matched documentation. Here is what to check, and why the 20mg size is the value pick. For laboratory research use only.
Platinum Biolabs ships every Reta 20mg vial with a batch-matched COA at 99%+ HPLC purity, from a US facility. Code PLATINUM25 takes 25% off your order at checkout.
For the full vetting checklist, see how to buy reta safely.
Because it holds twice the peptide, the 20mg vial almost always costs less per milligram than the 10mg:
| Vial | Price | Cost per mg |
| Reta 10mg | $105 | ~$10.50 |
| Reta 20mg | $179 | ~$8.95 |
If your protocol will use more than ~10mg total, the 20mg vial is the better value and means fewer reorders. See Reta 10mg vs 20mg and Reta 20mg vs two 10mg vials for the full comparison.
Buy Reta 20mg from a COA-backed US source, and choose the 20mg size when your protocol justifies it for the lower cost-per-mg. Once it arrives, see the Reta 20mg dosage guide.
Code PLATINUM25 takes 25% off at checkout. Every vial ships with a batch-matched COA at 99%+ HPLC purity.
Disclaimer: All information presented in this article is for educational and informational purposes only. Platinum Biolabs does not promote or endorse the use of peptides for human consumption. All products sold by Platinum Biolabs are intended strictly for laboratory and research use only. Consult a qualified healthcare professional before making any health-related decisions.