There is some evidence from a few small studies that the western diet has changed significantly in the last 20 years and there are certain vitamin and mineral deficiencies likely to be found in a typical American diet.
There are nutrients and herbs that have the potential to affect hair growth in a positive or negative way.
There are three basic ways that nutritional diet vitamin supplements and amino acid supplements may act influence the hair follicles. The mineral rich and vitamin supplements may act directly on hair stimulating or inhibiting growth activity or they may act indirectly through other intermediaries. For example, a vitamin supplement or herb may influence the production of a hormone to which hair follicles are sensitive. This change in hormone activity in turn may change the activity of the hair follicles.
Some minerals and vitamins can influence the activity levels of another vitamin and minerals. For example, intake of lysine, vitamin B12 and vitamin C help in absorption of other factors like iron. It is worth bearing in mind that the complexity of the body means there are many potential interactions for even the simplest nutrient....