Hair tissue mineral analsyis or HTMA testing is done when you send in your hair to a laboratory and then they essentially burn it using ion mass spectrometry to create a readout on the mineral ratios present in it. This is a reflection of the mineral ratios systemically throughout the body.  Matt Coffman is an HTMA practitioner that has done a lot of the same experiments that I've done as far as high dose copper supplementation and iron dumping protocols. He healed himself using HTMA principles of testing and retesting while taking strategic supplements to balance his ratios. In this interview he breaks down several of the big ratios and how they connect to hormones and other aspects of human physiology, why he thinks retinyl palmitate gets bad press, how heavy metals affect the adrenals, why he doesn't recommend taking zinc without copper, what ratio connects to your carb tolerance, which ratio connects to your thyroid gland, why supplementing calcium won't necessarily cause calcification, and more.  Matt Coffman's  website: www.integrativethoughts.com Matt Coffman's Instagram: https://www.instagram.com/integrativematt/ Order Valence Neutraceuticals supplements: https://valencenutraceuticals.myshopify.com/?ref=l6ncd4ca Discount BLACKBURN to save My website: www.matt-blackburn.com Mitolife products: www.mitolife.co Music by George Henner: https://georgehenner.bandcamp.com