How to prepare your hair for a lab test

https://future-wiki.win/index.php/How_to_prepare_your_hair_for_a_lab_test

To prep your hair for a lab test, skip any products like gels, sprays, or dyes for at least 72 hours beforehand. Wash it with a simple, sulfate-free shampoo and avoid conditioners or oils that could leave residue. Let it air dry fully, and don't use heat styling tools, as those can alter the hair's natural structure. Collect at least 50 strands from the root if trimming is required, storing them in a clean paper envelope. This keeps the sample pure for accurate drug or mineral analysis.