Caveat emptor: 90% of #tattoo inks have unlabeled or mislabeled ingredients - https://arstechnica.com/science/2024/02/caveat-emptor-90-of-tattoo-inks-have-unlabeled-or-mislabeled-ingredients/ yeah, injecting unknown, possibly poisonous substances under the skin always seemed folly to me...
Are you 100% certain you know the exact chemical composition of every mouthful of food you digest? You can't even trust the water 100%