At this concentration, 0.25mg equals 0.125ml (12.5 units on an insulin syringe)
A quick way to decide: start with the solvent on the certificate of analysis, fall back to bacteriostatic water for a standard sequence, and only reach for acid or base when a peptide visibly resists water
PMID 20727946
Once the needle is in the muscle, the plunger should be pulled back slightly to ensure the needle is not in a blood vessel
Giannoulis MG, Sonksen PH, Umpleby M, et al
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