Phosphorus (30,97 а.m.u.) – one of vital macronutrients. Most part of phosphorus is present in bones, but also in all other tissues and as a component of various proteins. Main sources of phosphorus in food – milk products, meat, eggs, beans. Phosphorus metabolism is mostly linked with calcium exchange. Main organ participating in phosphorus balance stabilization – kidneys.

Increased concentration of phosphorus in hair is indicated in cases of kidney diseases and increased intake of phosphate and D vitamin. Decrease of phosphorus level in hair could indicate decreased intake of phosphorus with food, disorder of protein digestion and inadequate intake of calcium or magnesium.