Only riboflavin, biotin, folate, and vitamin B12 deficiencies have been associated with hair loss.
To date, no clinical studies show that hair vitamins and supplements promote hair growth, prevent hair loss, or improve other facets of healthy hair such as dryness, shine, and thickness. In rare cases in which poor hair health is caused by nutrient deficiencies, taking supplements may improve hair quality.
Biotin. Biotin, also known as vitamin B7, stimulates the production of keratin to increase follicle growth. Biotin deficiencies tend to be rare, with those diagnosed with Biotinidase Deficiency being the most common.
However, vitamin B12 may give you the appearance of fuller and thicker hair because the increase in oxygen to hair follicles can help stimulate the replacement of lost strands. Vitamin B12 may also help give your hair an overall healthier appearance since intake of enough B12 is responsible for stronger hair shafts.
Here's the hard truth: Little can be done to permanently change the diameter of individual hair strands. Thickening products can do wonders to temporarily plump hair strands, but when it comes down to it, fine hair is genetic and can't be changed.
In other cases, thinning hair is triggered by something going on inside the body — for instance, a thyroid problem, a shift in hormones, a recent pregnancy, or an inflammatory condition. Hair loss may also be genetic. The most common genetic condition is known as female-pattern hair loss, or androgenic alopecia.
What vitamins are good for hair? Experts say that over-the-counter vitamins for hair growth and thickness often contain B complex vitamins, iron, protein, and vitamin D. "We know that low levels of these vitamins are associated with hair thinning," Dr. Zeichner tells Health.
Can Alopecia Be Reversed? Whether your hair loss is caused by hormones or an autoimmune disorder, regrowing your hair by using new medications and modifying your diet can be possible as long as you start treatment early.
Although hair re-growth may be possible, you should also know when to seek professional help. If the reason for thinning hair is genetics, it will not grow back on its own. To grow back a healthy, full head of hair, you'll need to take action, and that involves reviewing different hair loss options.
Anecdotal evidence, though, suggests hair may stop shedding and regenerate in as little as two months after treatment. A lack of vitamin D can lead to a number of symptoms, including hair loss.
“Supplementing vitamin D can often be helpful since most people are deficient—along with other key nutrients, typically iron, vitamin C, and biotin—in restoring hair loss. It certainly helps thicken existing hair,” Levitan says.
While folic acid is essential in supporting healthy hair growth, it is not the only vitamin or supplement that benefits both the hair and skin. Rather, it's best to choose hair care supplements that include additional hair-boosting ingredients, such as B complex, vitamin B12 and biotin.
Lifestyle factors could include using certain hair products, wearing your hair up too tightly, experiencing high stress levels, or not getting enough of certain vitamins and minerals in your diet. People who have immune system deficiencies could also have thinning hair.
Is it reversible? While some forms of AFAB hair loss are temporary, female pattern baldness is permanent and irreversible without treatment. However, proper treatment can stop the hair loss and potentially help regrow some lost hair.
Minoxidil: No Prescription Needed
Pros: Minoxidil (Rogaine, Ronoxidil) can stop hairs from getting thinner. It also can help some women regrow hair on the top of their head, says Paradi Mirmirani, MD.
How much B12 should I take daily for hair growth? The lowest amount recommended that should be traceable in your body is 2.4 mcg. While you are looking for a difference in your hair growth you can increase this dosage to 3 mcg and beyond.
The amount of biotin suggested for hair growth usually ranges between 100 - 1,000 micrograms (mcg) daily, but this number varies based on your body's reaction to biotin.