See it before you do it.
Reading how to mix a vial and watching someone mix one are different things. Five videos, in the order that makes sense to learn them, from clinicians and people who do this properly.
These are other people's videos. PepInfo did not make them and has no connection to the channels. They are collected here because they show the practical steps clearly — every one is credited and links back to its creator. Watch technique, but check any dose figures against the compound's own entry, since dosing advice varies a great deal between sources.
A path, not a playlist
Each one builds on the last. If you only watch one, watch the first — it covers the whole sequence end to end.
When you want the actual science
The videos above show you how. These explain why — compound by compound, with the evidence weighed rather than asserted.
Nick Norwitz MD PhD
Harvard MD, Oxford PhD in metabolic science. He reads the actual papers and walks through what they do and do not show — including when the honest answer is that the evidence is thin. That is rare in this space, and it is why he is worth more of your attention than most of what a search for these compound names will turn up.
Read his written deep-dive on peptides
Not affiliated with PepInfo, and he has no idea this page exists. Listed because the work is good. His channel covers far more than the six here — these are the compound-focused ones.
The three things to get right
Everything in these videos comes back to the same short list. If you remember nothing else, remember this.
Down the wall, never shaken
Aim the water at the inside of the vial, not at the powder, and swirl gently or just leave it. Shaking shears the peptide chain and there is no way to tell by looking that you have done it.
Units are volume, not dose
The mark on the syringe depends on how much water you added. Two people running the same dose can draw very different numbers of units. Work yours out rather than copying someone else's.
Cold, dark, and rotate
Reconstituted vials live in the fridge, out of the light, for about three to four weeks. Move the injection site every single time — repeatedly using one spot builds hardened tissue that absorbs unpredictably.
One needle, one use
Never re-use and never share. Swab the vial stopper and the skin, and put sharps in a proper bin rather than the kitchen rubbish.
Now work out your own numbers
The calculator turns your vial size, the water you added and the dose you want into the exact mark to draw to — and warns you when a dose is too small to measure accurately on an insulin syringe.