Dosing Guide — 2026-10-28
Reta 10mg is the most popular starting size for metabolic peptide research, and for good reason: a single vial covers the entire low-dose titration phase that most protocols begin with. This guide walks through what the compound is, exactly how to reconstitute and dose it, and how far one vial goes — in plain language, so you can plan a protocol without second-guessing the math. All information here is for laboratory research use only.
If you're ready to pick up a vial, the Reta 10mg page has current pricing and the batch COA, and the full step-by-step numbers live in the Reta 10mg dosing guide. We'll link both again where they're relevant below so nothing feels like a detour.
Reta is a triple receptor agonist — it interacts with the GP-1, GIP, and glucagon receptor systems at once. That three-way action is why it has drawn so much attention in metabolic research compared with single-pathway compounds. For the background on how it compares to earlier-generation agonists, what is reta covers the mechanism without the jargon.
Reta is a once-weekly compound. Research protocols start low and climb slowly — the gradual ramp is what keeps side effects manageable. Here is the standard schedule a 10mg vial is built around:
| Week | Dose | Units (U-100 syringe) |
| Week 1 | 2 mg | 20 units |
| Week 2 | 3 mg | 30 units |
| Week 3 onward | 4 mg | 40 units |
Four milligrams is the usual target — most protocols get their result there without going higher. If appetite control is already comfortable at 2 mg, holding there as a maintenance dose is perfectly reasonable. If results stall after 6–8 weeks at 4 mg, the next steps are 6 mg (60 units) then 8 mg (80 units), moving up only one step at a time.
Add exactly 1 mL of bacteriostatic water to the 10 mg vial. That gives you a clean, easy-to-read concentration:
So a 2 mg dose is 20 units, a 4 mg dose is 40 units — no awkward fractions. Inject the water slowly down the inside wall of the vial, swirl gently (never shake), and refrigerate once it's dissolved. If you're new to the process, the how to reconstitute Reta 10mg walkthrough has photos-worth-of-detail in text form. You'll also need bacteriostatic water, which is the preservative-containing water that makes multi-week use possible.
A 10mg vial holds 10 mg total, so the length depends entirely on your weekly dose:
| Weekly dose | Doses per vial |
| 2 mg | 5 weeks |
| 3 mg | ~3 weeks |
| 4 mg | 2.5 weeks |
Because almost everyone spends the first 2–3 weeks at the low end, a single 10mg vial comfortably carries you through the entire titration ramp. If your plan is to settle at 4 mg long-term, it's worth comparing against the larger size — the Reta 10mg vs 20mg breakdown shows where the 20mg vial becomes the cheaper choice per milligram.
Reta is injected subcutaneously, once per week, rotating sites week to week. Nausea and mild fatigue are most common in the first week or two and right after a titration step — if a dose feels rough, hold at the current amount an extra week rather than pushing higher. Dropping to 1 mg (10 units) temporarily until symptoms settle is a normal adjustment, not a failure. Adequate protein and resistance training matter here too, since rapid appetite suppression can cost muscle if nutrition slips.
Keep the dry (lyophilized) powder refrigerated before mixing. Once reconstituted, store the solution at 2–8°C and use it within about four weeks. Avoid repeated freeze-thaw cycles — they degrade the peptide and throw off your dose consistency.
Dose math only holds if the vial actually contains what the label says. Every Reta 10mg vial from Platinum Biolabs ships with a batch-matched COA showing 99%+ HPLC purity and is handled from a US facility, so potency stays consistent across the vial and your weekly units mean the same thing in week 6 as in week 1. Code PLATINUM25 takes 25% off at checkout. If you expect to run past the titration phase, the Reta 20mg vial doubles the supply at a better per-milligram price.
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.