help people digest their food better and absorb their nutrition better? >> yes, and their hair starts growing back. >> that's amazing. when you get a patient who walks in and says, look at my hair, what are you looking at? >> i'm looking at the whole body. i'm also looking at the pattern of hair loss. >> tell me about the pattern of baldness in the head. there's different patterns that tell you different things. >> yeah. so there's diffuse hair loss, falling out in the shower. >> all over. >> all over. >> that's why you -- >> yes. also, i look at them, if i see they're missing their eyebrows, the last one-third or thinning out, i'm already suspecting a thyroid deficiency in these men. >> diffuse hair loss and loss of eyebrows can be a thyroid issue. >> exactly. >> what about losing it in the front right here on either side? >> again, receding hairline, hair loss on the top, again, it's a thyroid deficiency. that gets overlooked in men, because men rarely come in --