Most contributors use 1 ml per 10 mg vial so that 10 units equal 1 mg, but some vary the volume by compound or to keep the injected amount between 0.1 and 0.5 ml. A few prefer working backwards from a target dose of 10 units or limit concentration to 30 mg/ml for GLP-1 agonists. One user splits larger totals into 0.5 ml per 10 mg to stay within typical vial capacity.
What this discussion establishesNothing here is advice.
Yeah there's no single answer since the peptide itself matters, but I can usually add the same volume of bacteriostatic water across most of my stack so the math stays consistent. I keep all the numbers in a spreadsheet and check it every time before injecting.
I prefer 1 ml so each 10 units equal 1 mg.
For the 10 mg vial I use 1 ml like the others mentioned. What dose are you planning?
It depends on the compound. For retatrutide I would use 0.5 ml.
I pick the volume mainly so the dose lands between 0.1 and 0.5 ml, and preferably under 0.3 ml because those syringes are easier to find. For GLP compounds I keep concentration at 30 mg per ml or lower.
That gives 2 mg per 0.1 ml and works easily with 0.3 ml syringes.
With 1 ml you get twenty doses at 5 units each, which covers four weeks.
Looking at different reconstitution calculators online can give a useful overview since users settle on their own favorites.
Working backwards from the target dose works best. I add enough water so each dose measures 10 units. The exact amount depends on the planned dose and vial size. When doing several vials at once it's simpler to choose the injection volume first then calculate the dilution needed.
Some compounds are dosed in international units rather than milligrams so confirm whether your target is mg or IU. For mg dosing add 1 ml per 10 mg unless the total exceeds 30 mg since most vials hold 3 ml. For anything larger split it to 0.5 ml per 10 mg which makes the solution more concentrated so that 0.1 ml equals 0.5 mg.
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