Bac water/peptide ratio

A reverse calculator can help figure out the exact amount of bac water needed based on the target draw. I usually add 2-3 ml of bac water unless the peptide tends to sting, in which case I dilute more. There are also cases like very small doses where different volumes make sense. For ordinary peptides I try to land around 20 units per dose for easier measuring. Insulin syringes top out at 30, 50, or 100 units, and those volumes all appear acceptable for subq use.

The idea of one common rule for all peptides is not accurate, and the amount really varies by compound. I prefer to keep injections at 35 units or less and at least 10 units when possible. Some peptides are too reactive for that approach, but I avoid most of them. In the past I reconstituted one compound very weakly at 12 ml for 70 mg, yet a later batch worked fine at 3 ml for 50 mg. For another peptide I combine three vials with 2.25 ml total and filter into one cartridge to hit 10 units per 1 mg daily dose over a cycle. I keep tirz at 22 mg per ml simply because that is the strength I began with and have continued using.

So another question is whether concentration itself matters. Is it safe to reconstitute 40 mg of that peptide in 2 ml of bac water?

I'm moving to the next vial size. I'll add 2 ml bac water so a 7 mg dose comes out to roughly 0.23 ml. That should give just over eight doses per vial. Using 2 ml now that the per-injection amounts are higher feels better than the previous 7-8 mg shots and also makes drawing easier. I'll apply the same approach to the 30 mg vials.

Alright, got it. So concentration is not really an issue except with certain stingy peptides, and then it is only about comfort during injection.

I reconstitute, transfer into a larger vial, and then add more bac water. For example with a 3 ml vial holding 50 mg I start with 2.5 ml, move everything into a 5 ml sterile vial, and add another 2.5 ml for a final 5 ml total.

One thing not yet mentioned is that higher concentration means the syringe must be loaded more precisely, since small volume differences create larger dose variations.