What Supplements Cause Hair Loss?

Vitamin A

Vitamin A is an essential nutrient for healthy cell and tissue development, including healthy hair growth. Furthermore, because vitamin A acts as an antioxidant, it also safeguards your hair follicles against damage caused by free radicals. Doses between 5,000 to 35,000 are beneficial to hair growth because it helps stimulate the cells on the hair follicle.

However, too much can have detrimental effects, because it is a fat-soluble vitamin, its stores can build up in the body and lead to an overdose. An overdose of vitamin A can inflame the hair follicles, leading to hair loss. It is difficult to overdose through your diet alone, but you may be at risk if you take supplements. Amounts of 25,000 IU or more may be toxic and cause temporary hair fall. If hair fall occurs as a result of too much vitamin A, stopping or drastically reducing your intake of the vitamin should be enough to reverse the problem.

What Supplements Cause Hair Fall?


Zinc is a trace mineral that is found in the body. It plays a vital part in many bodily processes and functions such as in cell reproduction, hormonal balance, proper absorption of vitamins, and in protein synthesis. All these processes are vital for proper hair growth and one chief sign of zinc deficiency is hair loss. The recommended daily amount of zinc is only about 11 milligrams. To counter hair fall, a dosage of 60 milligrams is effective.

However, too much of a good thing is not always good either. Taking too much or taking zinc supplements longer than recommended would do more harm than good to your hair. This is very probable because too much zinc in the body can hinder the absorption of other minerals such as copper, iron, magnesium and manganese, all of which may also take part in maintaining healthy hair. And, it is a common fear that too much zinc in the body can raise levels of DHT.


Selenium helps the body create antioxidant enzymes - proteins that protect cells from damage caused by free radicals. However, excessive zinc intake will affect the balance and proper absorption of other important nutrients such as calcium, Vitamin A, B vitamins and magnesium. The imbalance and improper ratios of these vitamins and minerals may contribute to hair loss.

Selenium also is necessary for the thyroid gland to function normally. If the thyroid gland is overactive or underactive, alopecia hair fall may result.


The thyroid gland relies on iodine to make the hormones necessary for the growth of healthy hair , teeth and bones. When we are deficient in this nutrient, the health of our hair can suffer, leading to hair weakness or total hair fall. However, An excess of iodine in the body can adversely affect the thyroid. When the thyroid function is too high, the cells that produce hair stop production and cause hair to fall out.

Per the recommended daily allowances for iodine, adults need 100 mcg to 200 mcg of dietary iodine daily. Hair loss will be restored when the iodine is excreted from the blood, causing thyroid function to return to normal.


Cases of excess oestrogen are rare but can occur due to use of oral contraceptives or post-menopausal hormone replacement therapy (HRT).

The estrogen dominant condition mimics the effects of hypothyroidism by interfering with thyroid hormones. Hair loss is a well-known side effect of hypothyroidism.

It has been theorized that excess estrogen may be a key cause of DHT accumulation within the hair follicle. Estrogens are approximately 1000 times more potent than testosterone, therefore their high affinity for attachment to androgen receptors significantly reduces testosterone attachment, thus the cells respond by keeping DHT elevated within the cells.