answer:Many people say taking biotin helps. Really the best way to let hair get long is to let it grow. Some people believe if they trim their hair it will grow faster, that isn’t true. But, if you tend to get dry or split ends, trimming it will help it stay healthier. Our hair has a life cycle, and if your cycle is naturally short then your hair will be shorter. Think of your eye lashes, they never grow past a certain length, they are kind of programmed to be that length, I think that is true for the hair on our heads also. Also, there is some question about iron affecting hair growth that low iron/anemia can cause hair to not grow well. Hair grows and average of ¼ to ½ an inch a month. Mine is definitely on the ¼ inch end and my husband’s on the other, his hair grows like a weed. I am so jealous. It is thick and gorgeous and soft. Mine is thin and dry and never grows very long. We eat the same diet pretty much, it’s genes. Lastly, thyroid and other hormones greatly affect hair growth. If your thyroid is under or overactive you are likely to have thinning hair that falls out a lot. I think you should wash your hair a little more often so you don’t risk oils getting trapped in your follicles and scalp.