Question 1

What is the half-life of Retatrutide?

Accepted Answer

Retatrutide has a half-life of approximately 6 days, allowing for once-weekly dosing. Steady state is typically reached after 4-5 half-lives (approximately 24-30 days).

Question 2

How do I reconstitute peptides with bacteriostatic water?

Accepted Answer

To reconstitute peptides, inject bacteriostatic water slowly down the inside wall of the vial containing the lyophilized peptide. Gently swirl (do not shake) until dissolved. The concentration depends on how much water you add - for example, adding 2ml of water to a 10mg vial gives a 5mg/ml concentration.

Question 3

What is the half-life of CagriSema?

Accepted Answer

CagriSema (Cagrilintide + Semaglutide combination) has a half-life of approximately 8 days, supporting once-weekly administration.

Question 4

How many units of insulin syringe equal 1mg of peptide?

Accepted Answer

The number of units per mg depends on your reconstitution concentration. For example, if you add 2ml of bacteriostatic water to a 10mg vial (5mg/ml concentration), then 20 units (0.2ml) would contain 1mg of peptide.

Water	Conc.	10u =	1mg
0.5mL	4.0	0.40mg	25.0u
1mL	2.0	0.20mg	50.0u
1.5mL	1.3	0.13mg	75.0u
2mL	1.0	0.10mg	100.0u
2.5mL	0.8	0.08mg	125.0u
3mL	0.7	0.07mg	150.0u
4mL	0.5	0.05mg	200.0u
5mL	0.4	0.04mg	250.0u

Water	Conc.	10u =	1mg
0.5mL	4.0	0.40mg	25.0u
1mL	2.0	0.20mg	50.0u
1.5mL	1.3	0.13mg	75.0u
2mL	1.0	0.10mg	100.0u
2.5mL	0.8	0.08mg	125.0u
3mL	0.7	0.07mg	150.0u
4mL	0.5	0.05mg	200.0u
5mL	0.4	0.04mg	250.0u

Peptide Calculator

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Quick Reference: 2mg Vial

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Peptide Calculator

Reconstitution Calculator

Results

Quick Reference: 2mg Vial

Medical Disclaimer