Ink manufacturers like StarBrite, Intenze, and Dynamic Color strictly follow proper health standards to sustain the safety and longevity of their products. You can buy from them. Intenze uses a third-party sterilization arrangement to sterilize their ink. StarBrite has certified lab rooms to make their inks, where they apply gamma rays to make their ink sterile. And as for Dynamic Color, they will give you a safety data sheet (SDS) showing their protective and safety measures.