the invention relates to formulations useful in treating hair disorders , improving the health of hair , increasing hair growth , and in increasing the niacin content of hair follicles . nicotinic acid alkyl esters having a straight chain alkyl group of from 1 to 22 methylene units , preferably from 6 to 16 methylene units , and most preferably from 8 to 14 methyl units , may be used , alone or in combinations for treating these conditions .