BOSTON – .
This is an important question because patients consider supplements as “natural and healthy,” not as drugs or chemicals, Wilma F. Bergfeld, MD, said at the annual meeting of the American Academy of Dermatology.
Dr. Wilma F. Bergfeld
Some of these products contain botanicals, which are not always safe, added Dr. Bergfeld, professor of dermatology and pathology at the Cleveland Clinic. “They have many activities, and they are being touted as having some activity in helping the hair or enhancing hair growth,” including having 5-alpha-reductase inhibitors as an ingredient. “Saw palmetto is probably the most common one, but there are a host of natural ingredients that are being put into these supplements, including those that promote androgen induction, as well as antioxidants and anti-inflammatories.”
In the opinion of Dr. Bergfeld, a nutrition-focused physical assessment should include an examination of the scalp and all hairy areas. “It’s also important to see the symmetry and shape of hair growth or hair loss areas, the distribution, hair color, the thickness and texture of the hair fibers,” she added.
Besides asking about what supplements patients are taking, other questions to ask during the visit include: Are you noticing more hair on your brush, pillow, and shoulders, or in the shower? Do you think your hair is thinning? What are your medical problems? Have you experienced rapid weight loss? Have you started any new medications? What medication(s) are you on? What foods do you eat? Do you have a family history of hair loss?
Possible causes of hair loss or changes include environmental factors, stress, hormonal changes, medications, and nutrition.
Common ingredients contained in healthy hair supplements include biotin, folic acid, L-cysteine, L-methionine, MSM (methylsulfonylmethane), vitamin B complex, and vitamins A, C, D, and E. “Vitamin D and A are associated on the hair follicle receptor sites, and they balance each other, so if one is down the other is usually down,” said Dr. Bergfeld, who directs Cleveland Clinic’s hair disorders clinic and its dermatopathology program. Other important ingredients include iron, zinc, manganese, amino acids including L-Lysine, and fatty acids.
Iron deficiency is a known cause of hair loss. “The absorption of iron relies on vitamin C and sometimes lysine,” she said. Red meat has a high iron content and since many patients are restricting red meat intake, “they do need to think about that.” Zinc deficiency is less common in Western countries, she continued, “but when you find it, it’s revolutionary because if they’re shedding hair and their hair character is changing, often some supplementation will do the trick. But remember: Zinc is not only an anti-inflammatory, it’s also an antiandrogen. It has 5-alpha-reductase inhibitor capabilities.”.
Dr. Bergfeld noted that biotin, also known as vitamin B7 and found in many foods, is used in many vitamin supplements marketed for hair loss. The recommended daily allowance (RDA) is 30 mcg/day in adults but the amount in hair supplements can be up to 650% of RDA. “Biotin at high levels is believed to be safe, but can interfere with troponin and other lab testing,” she cautioned. “This can lead to dangerous false laboratory results.”
To date, insufficient data exist to recommend supplementation with zinc, riboflavin, folic acid, or vitamin B12 for hair loss, “but they may help in cases of deficiency,” said Dr. Bergfeld, a past president of the American Hair Research Society. The use of vitamin E and biotin supplementation is not supported in the literature for treating androgenetic alopecia or telogen effluvium. Excessive vitamin A (not beta carotene) and selenium can contribute to hair loss and studies have shown a relationship between androgenetic alopecia and low vitamin D levels. “Vitamin D should be supplemented if serum levels are low, but more studies are needed to determine the effect of iron and zinc supplementation” in patients with androgenetic alopecia, she said.
While there are not enough data to support a recommendation for supplementation of folic or B12 for alopecia, she said, “vitamin B12 deficiency may occur in androgenetic alopecia patients, associated with pernicious anemia.”
She added that the use biotin supplementation for the treatment of androgenetic alopecia is not supported by available data, and “it is also unclear if selenium plays a role in this disease.”
Dr. Bergfeld reported having no disclosures related to her presentation.