All depends on what you are making but I normally use 1 leaf of gelatine to 250ml of dense liquid
Gamidov SI, Ovchinnikov RI, Popova AY, Avakyan AY, Sukhikh GT
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Loss of NAMPT in aging retinal pigment epithelium reduces NAD(+) availability and [PMID: 29905535] Laboratory literature summary: Loss of NAMPT in aging retinal pigment epithelium reduces NAD(+) availability and promotes cellular senescence
Presented for research literature review only Redick JA et al
In clinical contexts, you need peptide vials lasting a minimum of 8 weeks, syringes, alcohol swabs, and bacteriostatic water