Vitamins for Hair Loss: Evidence, Intake, and More

A comprehensive guide to the science behind the supplements.

Experiencing a confidence boost post a fresh haircut is something most of us are familiar with. A few years ago, I was in that exact situation, eagerly waiting for that boost while seated comfortably at my favorite salon. As my stylist was brushing and drying my hair in preparation for the final reveal, she abruptly stopped; her mouth agape as clumps of my hair fell on the floor. We both stared at the mirror in shock, taking in the newly formed bald spot on my head. In the ensuing months, I consulted with a dermatologist who helped me deduce that the hair loss was a result of psoriasis on my scalp. During this period, I struggled with feelings of insecurity and shame as I waited for my hair to regrow. I want you to know that if you're dealing with hair loss or thinning hair, you're not alone. It's common for hair loss to trigger feelings of anxiety, anger, depression, embarrassment, decreased self-confidence, and even social withdrawal. Naturally, one may consider resorting to the various vitamins and minerals available in the market to combat hair loss. However, it's vital to consult with a healthcare professional to understand the underlying cause of your hair loss. This article attempts to shed some light on the efficacy of vitamins and minerals in treating hair loss.

Common Causes of Hair Loss

Factors such as hereditary conditions like androgenetic alopecia, hormonal shifts, intense stress, and dietary insufficiencies are among the leading triggers of hair loss. "In my professional experience, hypothyroidism, nutrient deficiencies, hormonal imbalances, and stress are the most prevalent causes of hair loss," notes Anya Rosen, M.S., R.D.Hair shedding may also happen due to malnutrition in individuals with eating disorders (ED). Even in the absence of an ED, inadequate food intake or lack of certain nutrients can lead to hair loss. "Deficiency in essential nutrients and vitamins such as iron, protein, biotin, and zinc might induce hair loss," states Kristin Draayer, M.S., R.D.N. Other usual causes encompass aging, overuse of hair styling or treatments such as bleaching, inflammation, medical conditions like alopecia areata (an autoimmune disorder), specific medications, scalp psoriasis, and scalp infections.

The Role of Vitamins in Hair Health

The integral role of two vital vitamins - Biotin (B7) and Vitamin D, along with two minerals - Zinc and Iron in promoting hair health cannot be understated. Biotin is linked to the creation of keratin, a key protein that constitutes the hair structure, thus it's often a crucial component in supplements designed to enhance hair aesthetics. On her part, Rosen conducts regular checks on her clients' Vitamin D levels, as it is necessary for facilitating proper signaling pathways associated with hair follicle growth and differentiation. Iron, also plays pivotal roles directly and indirectly in hair health. It facilitates adequate production of hemoglobin, a protein found in red blood cells that transport oxygen to the body cells engaged in hair growth and repair. Additionally, Iron is required for optimal thyroid function and deficiency can result in hypothyroidism which can further escalate hair loss. The gene-regulating mineral, Zinc, is equally significant as it performs fundamental functions within a hair follicle, aids in speeding up follicle recovery and prevents follicle regression.

Scientific Evidence For the Effectiveness in Vitamins Treating Hair Loss

Although specific micronutrients are crucial to maintaining hair health, the existing scientific literature does not fully endorse the use of supplements such as vitamins and minerals unless a deficiency exists. For example, a comprehensive review concluded that there is insufficient proof to advocate for biotin supplementation for hair health in individuals without a deficiency. Draayer verifies that while biotin supplementation isn't proven to boost hair growth, those who lack this vitamin might see improvements, as a biotin deficiency can lead to hair thinning and fragility. The relationship between low vitamin D levels and various forms of alopecia (hair loss) has been demonstrated in numerous studies, but there is still inadequate evidence to recommend vitamin D supplementation for hair loss. The debate over whether iron supplementation could be beneficial for hair health remains unresolved, according to another study. Over-supplementation with iron can result in toxicity and severe side effects. Zinc's situation parallels that of iron; it can become dangerously toxic if taken unnecessarily. However, there seems to be a correlation between zinc supplementation and hair growth in individuals with a zinc deficiency. Overall, research suggests that a micronutrient deficiency could be a controllable risk factor in the development, prevention, and treatment of alopecia through appropriate supplementation. Rosen and Draayer concur with these findings. Rosen asserts that supplementation with vitamins or minerals will only benefit hair loss if it is triggered by a micronutrient deficiency. For other causes of hair loss, Draayer advises that micronutrients likely won't have a significant impact. In all scenarios, addressing the root cause is crucial.

Recommended Daily Intake of Vitamins and Minerals for Hair Health

We require different amounts of micronutrients, and when it comes to the four we need for hair health, here is what we need and how to get it from food:


Adults need at least 30 mcg per day, which can be met by regularly consuming foods like eggs, salmon, mushrooms, sweet potatoes, avocados, beef or chicken liver, and sunflower seeds.

Vitamin D

Between the ages of 19 and 70, human beings require a daily amount of 15 mcg or 600 international units (IU) of vitamin D. Regular exposure to sunlight with skin uncovered is an excellent source of this essential nutrient. Consuming foodstuff enriched with vitamin D such as fatty fish varieties like salmon, trout, tuna, and mackerel, eggs, and dietary products and cereals fortified with vitamin D can also help fulfill your vitamin D requirements. Furthermore, it's beneficial to incorporate fat in your daily diet since vitamin D is fat-soluble, which means it necessitates fat for proper absorption.


It is essential for men to consume 8 mg and women 18 mg of iron daily. This requirement can be fulfilled by incorporating both heme and non-heme sources into your diet. Heme sources include animal-based foods such as red meat and poultry, while non-heme sources are plant-based, like legumes and spinach. Although heme iron is more easily absorbed by the body, you can enhance absorption of non-heme iron by consuming foods rich in Vitamin C, including oranges, bell peppers, and broccoli.


It's essential for men to consume 11 mg and women 8 mg of zinc daily. You can acquire the necessary amount of this mineral from foods including meats, seafood, dairy items, and eggs. Even though beans, nuts, and whole grains contain zinc, it is not as readily absorbed as zinc from animal-based sources. Draayer mentions that "if individuals have deficiencies, dietary restrictions due to medical reasons, or specific health conditions, they might need supplementation. However, always consult a healthcare expert before starting any supplement regimen. Unnecessary supplementation or excessive vitamin intake may not provide extra benefits and could potentially cause harmful effects."

Other Natural Remedies for Hair Loss

Beyond vitamins and minerals, there is an array of natural solutions to consider that hinge on the root cause. This is a point that Rosen emphasizes; always identify the underlying problem first. For instance, issues like hypothyroidism and hormonal imbalances can be rectified through dietary changes, supplements, and lifestyle modifications. "In instances where my clients suffer hair loss due to malnutrition, our focus shifts towards repairing their connection with food, and ensuring consumption of adequate calories from a diverse range of food groups daily," she explains. In cases where stress is the culprit, Draayer champions stress alleviation techniques such as yoga, meditation, or deep breathing exercises. Additional remedies encompass scalp massage, essential oils and other types of oil (like pumpkinseed oil), medicinal plants, proper hair care, and platelet-rich plasma (PRP). Similar to when contemplating supplementation, it's advisable to consult with your healthcare professional before exploring other alternatives.

When to Consider Medical Intervention

Hair loss is a common occurrence in life, often triggered by hormonal changes such as during pregnancy, or due to significant stress events, like a car accident or divorce. These situations will generally lead to temporary hair loss that resolves itself with time. However, there are circumstances where immediate medical intervention for hair loss becomes necessary. Draayer suggests seeking professional help if hair loss is rapid, sudden, unexplained or continues for an extended period. Such instances could be symptoms of underlying health issues, hormonal imbalances, or nutritional deficiencies that need professional evaluation and appropriate treatment. Losing your hair can be a harrowing experience and the lure of supplements promising hair growth can be irresistible, not to mention expensive. The course of action you decide upon is deeply personal and should ideally be taken with the guidance of a medical provider, ensuring a safe and effective recovery process.

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