Although hair analysis may have limited value in detecting the presence of certain minerals, it is not routinely useful in determining a person's nutritional state.1-3Dr Siegel's letter points up how difficult it can be for a scientist to write a brief article in simple language about a complex topic. The health quack has no such difficulty. For only $30 plus a lock of your hair, he will be happy to tell you what food supplements you should take.
Barrett S. Hair Analysis: Reality vs Quackery-Reply. Arch Intern Med. 1978;138(12):1864. doi:10.1001/archinte.1978.03630370070031