Hair loss is one of the signs and symptoms of hypothyroidism. Here are a few things you can do to promote a healthy head of hair.

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Use a supplement called evening primrose oil (EPO). This contains the highest amount of GLA (gamma-linoleic acid) in any food and has proven to be very helpful to many people suffering with hypothyroidism.
Increase your protein intake. Protein plays a key role in maintaining a healthy hair. Experts recommend that you consume about 0.5 grams of protein for each pound of body weight, daily. Choose high quality protein that is low in fat. Examples of low-fat protein are lean cuts of meat and poultry, fish, and buffalo.
Include a B complex supplement in your diet. B vitamins are very important in maintaining a healthy hair, in particular vitamins B3, B5 and B3.
Nutrients such as biotin, inositol, folic acid, sulfur, magnesium and zinc also are vital.
Take supplements containing L-Cysteine and L-methionine. These two amino acids can help enhance texture and growth of hair. The recommended serving is 500 mg each twice a day and on an empty stomach.