1. Vitamin A
This includes hair, the fastest growing tissue in the human body. Vitamin A also helps skin glands make an oily substance called sebum. Sebum moisturizes the scalp and helps keep hair healthy Cod liver oil is a particularly good source.
1. Biotin
Associated Data
Data Availability Statement Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.
Vitamin D
Supplementation with vitamin D may not have direct links with hair growth, but having a deficiency may impact hair health.
A 2019 review found evidence to suggest a link between vitamin D deficiency and alopecia areata, which can involve severe hair loss. Many of the studies in the review found low levels of vitamin D in people with alopecia areata. According to the review, some research also suggests that symptoms of alopecia areata may be more severe in people with low levels of vitamin D. However, the authors of a 2016 study that collected information from 55,929 women in the United States did not find a strong link between total vitamin D intake and hair loss in alopecia areata.
There is also little evidence to suggest that vitamin D can lead to hair regrowth. Some studies have found that low vitamin D levels may be associated with female pattern hair loss, which is the most common type of hair loss in women. Getting enough vitamin D The Office of Dietary Supplements recommend that adults get 600 international units (IU) , or 15 micrograms (mcg), of vitamin D per day.
People can find out their vitamin D levels and whether or not they are deficient by asking their doctor for a blood test. Few foods contain significant amounts of vitamin D, but the following foods are among the best sources: fish, such as salmon or swordfish
mushrooms
egg yolks
fortified orange juice
fortified milk Sun exposure is also essential, as this enables the body to produce vitamin D. People should remember to wear sunscreen , however, as too much sun exposure over time can lead to skin damage. However, taking vitamin D in very high doses can lead to toxicity that may result in severe complications.
An excessively high dose would be over 50,000 IU or when blood levels of vitamin D are greater than 150 ng/ml .