How to Prepare Hair for a Lab Test Without Damaging It

https://thehairtestpreparationtips.ironwoodscope.com/posts/how-to-prepare-hair-for-a-lab-test-without-damaging-it

Skip heavy oils or conditioners right before your test—they can coat the strands and skew results. Wash your hair the night before with a gentle, sulfate-free shampoo and let it air dry completely. Avoid any styling products, including gels or sprays, and don't use heat tools that day. If your test involves the scalp, just brush lightly to remove loose skin cells. Keep it simple: clean, dry, and untouched is your best bet, and it won't stress your hair at all.