yes absolutely, used to do it with multiple peptides daily, like 10-15 different peptides, but now I only do it with a couple since I've had ZERO positive effect from most peptides. Tried about 25-30 different ones and only could see benefits from 4-5 of them max. So, for now I'm only doing GLP1's, HCG, and HGH, and rarely dabble in on one or two more, but you can rest assured that I'm absolutely using that one exact needle for all of them, and to make the matters worse (actually better) I use that needle for at least couple weeks sometimes even longer. honestly it is not a matter of cost to me, but it looks stupid to me to use like 10 syringes when one is good enough, plus people act as if I'm injecting/sharing it with some alien from another planet lol, it is my body dude, in and out of my body several time what difference does it make.