Common hair problems are not always genetic. Sometimes, your dietary habits play an important role in maintaining hair health. A number of vitamins, and their deficiencies, can determine how well your hair growth thrives. Addressing these shortcomings can help with better hair growth and maintain overall hair health. Here are 5 vitamin deficiencies that are linked to poor health growth and also mentioned are the food sources that can help manage these deficiencies. A study in the Nutrients Journal notes that adequate consumption of vitamin A is necessary for the maintenance of healthy skin and hair. However, the study also warns that too much or too little of the vitamin can worsen hair health.