The Nutritional Root Causes of Hair Loss

Your doctor says it's stress. Your dermatologist says it's genetic. But it's not genetic, and it's fixable.

Hair loss is a symptom of systemic deficiency

Your hair is the last thing your body prioritises. When nutrients are scarce, your body preserves them for organs that keep you alive. Your heart, your brain, your immune system. Hair gets what's left.

This means that hair loss is often the first visible sign that something deeper is wrong nutritionally. It's your body's way of saying: I don't have enough fuel to maintain luxury functions.

The most common nutritional causes of hair loss are iron deficiency, zinc deficiency, B vitamin deficiency (especially B12 and folate), biotin deficiency, and thyroid dysfunction usually from iodine or selenium deficiency.¹

Unlike androgenetic alopecia, which is genetically programmed, nutritional hair loss is reversible. Fix the deficiencies and your hair grows back. The key is recognising which type you have.

Hair loss from nutritional deficiency is your body's distress signal. Fix the nutrition and the hair returns. Ignore it and it compounds over years until you're significantly bald.

Iron and ferritin drive hair growth

Low ferritin is one of the most common causes of hair loss, especially in women. Hair follicles require iron for the anagen (growth) phase. Without sufficient ferritin, your hair shifts prematurely into the telogen (shedding) phase.

If your ferritin is below 70 ng/mL, hair loss often occurs.¹ You might have normal haemoglobin and be told your iron is fine, when in reality your ferritin is depleted and your hair is dying as a result.

Women losing hair should get ferritin tested immediately. If it's below 50 ng/mL, iron supplementation (preferably through organ meats) is essential for hair recovery. Eating beef liver twice weekly will raise ferritin faster than any oral supplement.

Men rarely suffer from iron-deficiency hair loss unless they have hidden bleeding or are vegan. But post-menopausal women can unknowingly have depleted iron for years without realising it's the cause of their hair loss.

Zinc is the mineral your scalp requires

Zinc is a cofactor for protein synthesis, and hair is pure protein. Without zinc, your scalp can't produce new hair, and existing hair becomes weak and brittle. Telogen effluvium, a type of hair shedding triggered by stress or deficiency, is strongly associated with zinc deficiency.

Oysters are the richest source, providing 11 mg of zinc per 100g serving. Beef provides 5-8 mg per 100g.⁴ Organ meats provide similar amounts. Most plant sources provide minimal bioavailable zinc, which is why vegetarians and vegans frequently experience hair loss.

If you're vegetarian or vegan, zinc deficiency is likely, and hair loss is one of the first signs. Supplemental zinc helps, but food sources are far superior.

Zinc also supports immune function and wound healing, both of which are critical for scalp health. Scalp inflammation accelerates hair loss. Adequate zinc keeps the scalp healthy and hair rooted firmly.

Biotin and B vitamins support hair structure

Biotin is a B vitamin that supports keratin production, the protein that makes up your hair shaft. Deficiency causes brittle, thinning hair that breaks easily. Hair becomes limp and loses lustre.¹

Beef liver provides biotin along with B12, folate, and other B vitamins. These work synergistically to support hair growth and prevent shedding. A single serving of liver provides more of these nutrients than most people consume weekly.

B12 and folate deficiencies cause hair loss through multiple mechanisms. They disrupt the normal hair growth cycle, reduce nutrient absorption needed for hair health, and cause anaemia, which itself causes hair loss. If you're vegetarian or have low stomach acid, B12 deficiency is nearly certain.

Supplemental biotin helps somewhat, but it works far better when accompanied by adequate B12, folate, iron, and zinc. These nutrients work as a team.

Thyroid function determines hair health

Your thyroid controls your metabolic rate and hair growth cycle. Hypothyroidism (low thyroid function) causes hair loss and widespread hair thinning. The hair becomes dry, brittle, and falls out in clumps.

Thyroid function depends on iodine, selenium, iron, and zinc. Deficiencies in any of these create hypothyroidism, which causes hair loss. Most people's thyroid problems are nutritional, not pathological.

Fix your ferritin, zinc, and selenium levels and your thyroid often recovers without medication. Get your TSH and free T3 tested. If TSH is elevated but you don't have autoimmune thyroiditis, try nutritional intervention first.

Selenium is particularly important for thyroid peroxidase, the enzyme that produces thyroid hormones.² Brazil nuts, fish, and beef provide selenium. Most people don't eat enough.

If you're losing hair and you're hypothyroid, fix your ferritin, zinc, and selenium levels before assuming you need thyroid medication. Often these nutrient deficiencies are causing your thyroid to fail.

Cortisol and hair loss

Chronic stress elevates cortisol, which suppresses thyroid function, reduces nutrient absorption needed for hair health, and shifts hair follicles into the telogen phase prematurely. Stress-induced hair loss is well-documented.

If you're stressed and losing hair, you're creating a double problem. Stress suppresses the very nutrients your hair needs. Chronically elevated cortisol also increases DHT sensitivity in hair follicles, accelerating androgenetic alopecia.

Fixing cortisol requires genuine stress reduction (not just stress management), adequate sleep, minerals, and nutrients. Magnesium, potassium, and sodium help regulate cortisol. Bone broth provides glycine, which supports cortisol metabolism and sleep quality.

The protocol for hair recovery

• Eat organ meats 2-3 times weekly. Beef liver provides iron, zinc, biotin, and B vitamins. All the nutrients hair follicles require. Start with liver pate if the taste is unfamiliar.
• Eat oysters or shellfish weekly. Oysters provide zinc and selenium, critical for scalp health and thyroid function. One dozen oysters provides all the zinc you need weekly.
• Eat red meat 4-5 times weekly. Provides iron, zinc, B vitamins, and carnitine, which supports mitochondrial function in hair follicles.
• Add bone broth to meals. Provides collagen, glycine, and minerals that support both hair structure and cortisol regulation.
• Get nutrient testing. Ferritin, zinc, selenium, and thyroid function. If any are low, supplement or increase food sources immediately.
• Reduce stress genuinely. Hair loss from stress requires actual stress reduction, not stress management. This means reducing commitments and obligations that aren't serving you.
• Sleep 7-9 hours nightly. Hair growth happens during sleep. Sleep deprivation disrupts hair growth cycles and elevates cortisol.
• Eliminate seed oils. Oxidised seed oils promote inflammation and contribute to scalp problems and hair loss.