Reta 10mg vs 20mg: Which Vial Should You Buy?

Buying Guide — 2026-05-28

Reta is sold in two common research sizes — 10mg and 20mg — and "which one should I buy?" comes down to dose math, timeline, and cost-per-mg. The peptide inside is identical; only the total mass per vial differs. Here is how to choose.

Researcher special: code WELCOME at checkout unlocks 35% off Reta 10mg, Reta 20mg, the Metabolic Stack, and bacteriostatic water. Every vial ships with a batch-matched COA at 99%+ HPLC purity.

The Only Real Difference: Total Mass

Both vials contain the same lyophilized reta at the same purity. The 20mg vial simply holds twice the peptide. That changes three things: how long it lasts, cost-per-mg, and how you reconstitute it.

Dose Math: How Long Each Lasts

Reta research protocols typically titrate from 2 mg up to 12 mg weekly. Doses per vial:

A researcher on a low 2 mg starting dose gets over a month out of a single 10mg vial; at higher doses, the 20mg vial avoids buying multiple small vials.

Cost Per Milligram

The 20mg vial almost always costs less per mg than the 10mg vial — you pay more up front but less per unit of peptide. If your protocol will use more than ~10mg total, the 20mg vial is usually the better value. (See how much reta costs.)

Reconstitution Differences

With a 20mg vial you reconstitute at a higher concentration, or use more bacteriostatic water, to keep injection volumes reasonable. This is straightforward but worth planning so your per-dose volume lands in an easy-to-measure range on a U-100 syringe. See how to reconstitute peptides.

Who Should Pick Which

Choose the 10mg vial if - You are running a short or low-dose protocol - You want to validate purity and handling before committing to more material - Storage space or up-front cost is a constraint

Choose the 20mg vial if - Your protocol runs at higher doses or for several weeks - You want the best cost-per-mg - You prefer fewer reconstitutions and fewer vials to track

Bottom Line

The peptide is identical; pick by timeline and budget. Short or low-dose work favors the 10mg vial; longer or higher-dose protocols favor the 20mg vial for its lower cost-per-mg. For the underlying dose-duration math, see how long a reta vial lasts.

Code WELCOME at checkout unlocks 35% off Reta 10mg, Reta 20mg, the Metabolic Stack, and bacteriostatic water. Every vial ships with a batch-matched COA showing 99%+ HPLC purity — the same documented quality at either size.

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.