What is the philosophy/consensus around syringes lengths, and when to use shorter vs longer needle? Would you choose a different length depending on the amount of units you are injecting, say a small 15 units, vs a larger 35-40 units?
I recently picked up some 4mm needles and have been enjoying them, but did get a large bruise in the lower stomach after one injection of MOTS-C, 20 units if I recall.