In Reply.—
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.