Vitamins for Eyebrow Growth: The Complete Nutritional Guide
Thin, sparse, or slow-growing eyebrows aren't just a styling problem—they're often a sign that your body needs nutritional support. While topical serums and growth products have their place, the real magic happens from the inside out. The hair follicles in your brows are living tissue that require specific vitamins and minerals to thrive, and deficiencies in key nutrients can stall growth faster than over-plucking ever could.
We've researched the science behind eyebrow growth and identified the vitamins that actually make a difference. Here's what you need to know about feeding your brows from within.
The Key Vitamins for Eyebrow Growth
Biotin (Vitamin B7)
Biotin is the celebrity of hair growth vitamins, and for good reason. This B-complex vitamin is essential for keratin production—the primary structural protein in hair. Without adequate biotin, your hair follicles struggle to produce strong, resilient strands.
Studies show that biotin supplementation can improve hair thickness and strength, and your eyebrow hair responds just as well as the hair on your head. The typical recommended dose is 2.5 mg daily, though some people see results with 5 mg. Expect to wait 3-6 months for noticeable changes, since hair growth follows a specific timeline and biotin can't speed that up artificially—it just removes the nutritional bottleneck.
You'll find biotin in eggs, almonds, sweet potatoes, and salmon. If you're vegetarian or vegan, nutritional yeast and pumpkin seeds are solid plant-based sources. Many people prefer supplementation because you'd need to eat an unrealistic amount of food to reach therapeutic doses through diet alone.
Iron
Iron deficiency is one of the most overlooked culprits behind thin eyebrows. This mineral transports oxygen to your hair follicles, and without it, your brows literally can't access the nutrients they need to grow. Women are especially vulnerable to iron deficiency, particularly if they have heavy periods or follow a restrictive diet.
Signs of iron deficiency include fatigue, hair loss across your whole body, and eyebrows that shed more than usual. Before supplementing, get a blood test—iron levels matter. Too little is bad, but too much can be toxic. A normal ferritin level (the iron storage marker) sits between 30-100 ng/mL for healthy hair growth.
Animal sources like red meat, poultry, and fish absorb better than plant sources, but pairing plant-based iron (lentils, spinach, beans) with vitamin C boosts absorption. Many people benefit from 25-65 mg daily, but this varies based on your individual levels.
Vitamin D
Vitamin D regulates the hair growth cycle and keeps follicles in the growth phase longer. Deficiency is linked to hair loss, thinning eyebrows, and stunted regrowth. Most of us aren't getting enough—the sun alone rarely provides therapeutic doses, especially if you live north of the 37th parallel or avoid sun exposure (which, hello, skin cancer prevention).
We recommend getting your levels tested, then supplementing to reach 30-50 ng/mL. That usually means 1,000-4,000 IU daily for most people, though some need more. Vitamin D is fat-soluble, so take it with a meal containing fat for better absorption.
Zinc
Zinc is a growth mineral. Your body uses it to build new hair cells, repair damaged ones, and regulate the hormones that control hair growth. Deficiency causes hair loss, slow regrowth, and weak follicles—and zinc depletion happens quickly when you're stressed, sick, or following a restrictive diet.
Most people need 8-11 mg daily. Oysters are the richest source (if you eat seafood), followed by beef, pumpkin seeds, and chickpeas. Supplementing is smart if you're vegetarian or vegan, since plant-based zinc absorbs less efficiently than animal sources.
Vitamin B12
B12 supports cell division and DNA synthesis—both essential for generating new hair cells. Deficiency leads to weak, brittle hair and stunted growth. Vegans and vegetarians are at higher risk since B12 comes mainly from animal products, though it's also found in fortified cereals and some plant-based milks.
Most people need 2.4 mcg daily. If you're deficient, your doctor might recommend injections for faster correction, but oral supplements or dietary sources work fine for prevention and mild deficiency.