When patients come to MD Laser & Cosmetics worried about thinning hair, one of the first questions is, “Can vitamins or supplements help?” The honest answer: sometimes — when a genuine deficiency is part of the picture. Here is how a physician thinks about nutrition and hair loss.

Nutrition is one piece, not the whole picture

Hair loss has many causes — genetics, hormones, stress, medical conditions, and post-illness shedding among them. Nutritional deficiency is one contributor that is genuinely correctable, but supplements are not a cure-all. The first step is identifying why your hair is thinning, which is why Dr. Lin begins with an evaluation rather than a product recommendation.

Nutrients that support healthy hair

  • Iron — low iron (ferritin) is a common, often-missed contributor to shedding, particularly in women.
  • Vitamin D — linked to the hair follicle cycle; deficiency is widespread.
  • Zinc — supports follicle repair and function.
  • B vitamins, including biotin — involved in keratin production, though true biotin deficiency is uncommon.
  • Protein — hair is built from protein; inadequate intake can worsen shedding.

Importantly, taking high doses of supplements you do not need offers no benefit and can occasionally cause harm. Testing for an actual deficiency is the responsible approach.

Where supplements fit in a physician-led plan

At MD Laser & Cosmetics in San Mateo, Dr. Susan Lin treats hair loss as a medical concern. A nutritional review may be combined with in-office therapies such as PRP, scalp health treatments, and the physician-formulated MD® hair line. Hair loss treatment plans start at $500 and are individualized to the underlying cause.

A note on expectations

Hair responds slowly. Meaningful improvement in density typically takes several months of a consistent, well-targeted plan — there are no overnight fixes. A physician can help you set realistic expectations and track progress.

Frequently Asked Questions

Do biotin supplements regrow hair?

Biotin helps only if you are genuinely deficient, which is uncommon. For most people, biotin alone does not regrow hair. A physician evaluation identifies what is actually driving your hair loss.

Which vitamin deficiency causes hair loss?

Low iron and vitamin D are among the most common correctable contributors, particularly in women. Testing is the only way to know whether a deficiency is part of your hair loss.

How long until supplements help my hair?

Hair grows slowly. Even when a deficiency is corrected, visible improvement usually takes several months as part of a consistent, physician-guided plan.

Concerned about thinning hair? Dr. Susan Lin, M.D. personally evaluates and treats hair loss at MD Laser & Cosmetics in San Mateo. Learn about hair loss treatment or book a consultation.