Beets contain several nutrients and bioactive compounds that, on paper, look promising for hair health, but there is almost no direct clinical evidence in humans proving that eating beets or applying them topically will make your hair grow faster or thicker. The connection rests on plausible biological mechanisms, particularly the nitric oxide pathway and antioxidant activity, rather than on controlled trials in people. That gap between “theoretically helpful” and “proven to work” is worth understanding before you stock up on beetroot juice or start rubbing beet pulp on your scalp.
The Nitric Oxide Connection
The strongest theoretical case for beets and hair growth runs through nitric oxide. Beets are unusually rich in dietary nitrate, which your body converts into nitric oxide (NO) after consumption.1PubMed. The benefits and risks of beetroot juice consumption: a systematic review This conversion happens through what researchers call the nitrate-nitrite-nitric oxide pathway, and it results in higher NO availability throughout the body.2PubMed. Exploring the therapeutic potential of beetroot juice in patients with peripheral artery disease: A Narrative review The reason this matters for hair is that nitric oxide is a signaling molecule in the cells at the base of your hair follicles, known as dermal papilla cells. Research has identified NO as being involved in the regulation of hair follicle activity, including blood flow to the follicle and cell signaling that influences the hair growth cycle.3PubMed. Nitric oxide in the human hair follicle: constitutive and dihydrotestosterone-induced nitric oxide synthase expression and NO production in dermal papilla cells
This is not a fringe idea. The most widely used hair-loss treatment, minoxidil, works partly by widening blood vessels and increasing blood flow to the scalp. Research on minoxidil has shown that it enhances the survival rate of dermal papilla cells by boosting blood flow, and it was the first drug approved by the FDA for treating pattern hair loss in both men and women.4PubMed Central. Nitric oxide synergizes minoxidil delivered by transdermal hyaluronic acid liposomes for multimodal androgenetic-alopecia therapy One research group has even explored combining nitric oxide directly with minoxidil to boost its effectiveness. The logic with beets is similar in principle: if you raise your body’s NO levels through diet, you might get a milder version of that vasodilation effect at the scalp. The problem is that “might” is doing a lot of heavy lifting in that sentence. Drinking beet juice raises systemic NO levels, but nobody has measured whether enough of that increase reaches the scalp’s microcirculation to meaningfully affect hair follicle behavior.
What the Animal Research Actually Shows
The closest thing to a direct test of beets on hair growth comes from a study that applied beetroot fruit extracts topically to shaved animals and measured hair regrowth over 21 days. The researchers tested both methanol-based and ethanol-based beetroot extracts at different concentrations. They found that the treated areas showed more hair regrowth compared to untreated controls, with the ethanolic extract performing better than the methanol version. By day 21, the higher-concentration ethanol extract group showed hair lengths approaching roughly 6.7 millimeters, compared to about 4.6 millimeters in the untreated group, and the differences were statistically significant.5bioRxiv. Hair promotion effect of Beta vulgaris L. fruit extracts; physicochemical, and analytical evaluation
That sounds encouraging, but context matters. This was a preprint, meaning it had not completed peer review at the time of publication. It was also an animal study using topical extracts at controlled concentrations, not a human trial of eating beets or drinking beet juice. The researchers themselves acknowledged that the exact mechanism behind the hair-promoting effect is not fully understood, though they suggested it may relate to the antioxidant properties of phenolic compounds in the beet extract, as well as betalains causing vasodilation and increasing blood flow to the skin. Animal hair growth studies are common early steps in cosmetic research, but the gap between a shaved rodent regrowing fur faster and a person with thinning hair seeing meaningful results is vast.
Oxidative Stress, Antioxidants, and Hair Loss
Another line of reasoning connects beets to hair through their antioxidant content. Beets contain betalains, the pigments responsible for their deep red-purple color, along with vitamin C and various phenolic compounds. These act as antioxidants, meaning they neutralize reactive oxygen species (ROS) in the body. The reason this might matter for hair is that oxidative stress, an imbalance where ROS overwhelm your cells’ defenses, has been increasingly linked to common hair loss. Research has found that the buildup of reactive oxygen species causes cellular damage and accelerates the progression of androgenetic alopecia, the most common form of hair thinning in both men and women.6PubMed. The regulatory mechanisms of mitophagy and oxidative stress in androgenetic alopecia Separate research has confirmed that oxidative stress-induced disruption of hair follicles is a primary driver of androgenetic alopecia.7PubMed. Machine Learning Guided Discovery of Superoxide Dismutase Nanozymes for Androgenetic Alopecia
So the chain of logic goes: beets are rich in antioxidants, oxidative stress contributes to hair loss, therefore beets should help. Each individual link in that chain has some scientific support. The weak point is the final step, because eating antioxidant-rich foods raises your overall antioxidant capacity without necessarily delivering enough of those compounds to hair follicles specifically to counteract the localized oxidative damage driving hair loss. Your body has many competing demands for antioxidants, and hair follicles are not at the front of the line. This is a common issue with dietary interventions for hair: the nutrients do real things in the body, but translating whole-food consumption into a targeted effect at the follicle is not straightforward.
The Nutrients in Beets That Hair Actually Needs
Beyond the nitric oxide and antioxidant mechanisms, beets provide several micronutrients that play roles in hair health. One review of beetroot’s nutritional composition noted that beets contain silica, which supports the body’s use of calcium and is involved in maintaining healthy skin, hair, nails, and bones.8ResearchGate / Journal of Current Research in Food Science. Nutritional composition and value added products of beetroot: A review Beets also contain iron and folate, both of which matter for cell division, including the rapidly dividing cells in your hair follicles.
Iron is particularly interesting because its relationship to hair loss has been studied more than most nutrients. Multiple studies have examined whether iron deficiency contributes to hair loss, and while the evidence is mixed, some research has linked low iron levels to several types of non-scarring hair loss, including telogen effluvium (where large numbers of hairs shift into the resting phase and fall out) and diffuse thinning.9PubMed. The diagnosis and treatment of iron deficiency and its potential relationship to hair loss Beets are not an exceptionally high source of iron compared to red meat or lentils, but they do contribute, and the vitamin C in beets can help your body absorb plant-based (non-heme) iron more efficiently. For someone whose hair loss is related to borderline iron deficiency, adding beets to the diet could theoretically help, though an iron supplement and a conversation with a doctor would be more direct solutions.
Folate supports the production of red blood cells that carry oxygen to tissues, including the scalp. Potassium, which beets provide generously, acts as a vasodilator. The combination of these nutrients in a single food is genuinely useful for overall circulatory health, and good circulation is a prerequisite for healthy hair. But “prerequisite” is different from “treatment.” Your hair needs adequate blood flow the same way your lawn needs water, but turning on the sprinkler more does not make the grass grow twice as fast once it is already getting enough.
Topical Beet Treatments Versus Eating Beets
The distinction between applying beets to your scalp and eating them matters more than most people realize, because the two approaches deliver compounds through completely different routes. When you eat beets or drink beet juice, the nitrate follows its systemic pathway: it is absorbed in your gut, circulated through the bloodstream, reduced to nitrite by bacteria in your mouth (which is why antiseptic mouthwash can actually blunt the effect), and eventually converted to nitric oxide. The antioxidants are metabolized and distributed throughout the body. How much ends up specifically at your hair follicles is uncertain and likely small.
When you apply beetroot topically, the active compounds make direct contact with the scalp skin. The animal study mentioned earlier used topical extracts and saw measurable hair growth promotion. Some formulations described in the cosmetics literature involve beetroot-infused hair masks and oils intended to deliver betalains and other bioactive compounds directly to the follicles. The proposed mechanism includes improved local circulation from vasodilation and antimicrobial effects: betalains and flavonoids in beets may inhibit fungi like Malassezia, the primary organism behind dandruff, which could reduce scalp inflammation that otherwise impedes healthy hair growth.10International Journal of Pharmaceutical Sciences. Beetroot in Natural Skincare and Haircare: An In-Depth Exploration of DIY Formulations and Therapeutic Potential
The practical challenge with topical beet application is that rubbing vegetable matter on your head is not the same as a formulated pharmaceutical product designed to penetrate skin layers. Minoxidil works partly because its formulation is engineered for transdermal absorption. A beet mask might leave beneficial compounds sitting on the surface of your scalp without much of it penetrating to the dermal papilla where it would actually do something. If you enjoy the ritual and find it improves the feel of your hair, there is little harm, but calling it a hair-growth treatment overstates what the evidence supports.
Why Bioavailability Complicates the Picture
One underappreciated factor in the “beets for hair” conversation is bioavailability, which is how much of a nutrient or compound your body actually absorbs and uses versus how much passes through unprocessed. Beets contain carotenoids, for example, but research on blended fruit juices has shown that carotenoid absorption drops dramatically when consumed without dietary fat. In one digestion study, carotenes diminished by about half during gastric digestion, and carotenoids were undetectable in the final absorbed fraction when no fat was present. The same study found that consuming carotenoids with a meal dramatically improved absorption compared to consuming them alone.11Journal of Agricultural and Food Chemistry. Changes in Vitamin C, Phenolic, and Carotenoid Profiles Throughout in Vitro Gastrointestinal Digestion of a Blended Fruit Juice
This means the way you eat beets affects what you get from them. Roasted beets drizzled with olive oil and eaten alongside a meal will deliver more of their fat-soluble compounds than a glass of plain beet juice on an empty stomach. The water-soluble compounds, including the betalains and nitrate, are less affected by this, but they face their own bioavailability challenges. Betalains are somewhat heat-sensitive and can degrade during cooking, which is why raw beet juice is often promoted as the preferred form. These details rarely appear in popular articles that simply list beet nutrients as though your body absorbs every milligram.
The Honest Gap Between Mechanism and Proof
If you step back and look at the full picture, the case for beets helping hair growth sits in a frustrating middle ground. The biological mechanisms are plausible and overlap with pathways that proven hair-loss treatments target. Nitric oxide matters for hair follicles. Antioxidants protect against the oxidative stress that drives common hair loss. Iron and folate support the rapidly dividing cells that produce hair. Beets provide all of these things. But “providing ingredients that hair needs” is not the same as “treating hair loss,” just as eating calcium does not set a broken bone.
The honest assessment is that no controlled trial in humans has ever tested whether eating beets, drinking beet juice, or applying beet extracts leads to measurable improvements in hair growth, density, or retention. The single direct study used animal models with topical extracts and remains a preprint. Everything else is inferential, built by connecting beet nutrients to hair biology through pathways studied in other contexts. That does not make the idea wrong, but it makes it unproven. If you are experiencing meaningful hair loss, the evidence-based options remain things like minoxidil, finasteride (for men), and addressing any underlying nutritional deficiencies with targeted supplementation under medical guidance.
What Beets Can and Cannot Stain
One practical note that surprises people trying topical beet treatments: betanin, the red pigment in beets, is an enthusiastic stainer. It will dye light-colored hair pink or reddish-purple, which some people use intentionally as a temporary natural tint. If you have blonde or gray hair and are applying beet masks for growth purposes, you may end up with an unintended color change. The staining is temporary since betanin washes out over several shampoos, but it catches people off guard. Conversely, if you eat large amounts of beets, the pigment can color your urine and stool, a harmless phenomenon called beeturia that affects a meaningful minority of people and causes occasional panic in those unfamiliar with it.
Oxalates and Other Safety Considerations
Beets are generally safe to eat in normal dietary amounts, but they are among the common high-oxalate foods, alongside spinach and rhubarb.12Asia Pacific Journal of Clinical Nutrition. Oxalate content of foods and its effect on humans Oxalates can contribute to kidney stone formation when excreted in the urine, and they can also bind to calcium in the gut, reducing its absorption. If you have a history of calcium oxalate kidney stones, ramping up beet juice consumption specifically for hair benefits would be a questionable trade-off. The average English diet contains roughly 70 to 150 milligrams of oxalate daily, with tea being the largest contributor, and adding large amounts of beet juice could push that number significantly higher.
For most people without kidney stone risk, moderate beet consumption is perfectly fine and brings genuine cardiovascular benefits that are better supported by evidence than any hair-growth claim. Beet juice has been studied fairly extensively for blood pressure reduction and exercise performance, and the evidence there is considerably stronger. If you enjoy beets and want to add them to your diet, there are good reasons to do so. Just know that growing thicker hair is not among the reasons that science can currently back up with confidence.
When a Nutrient Deficiency Is the Real Problem
There is one scenario where beets might genuinely help your hair, though not because of anything unique about beets themselves. If your hair is thinning because of an underlying nutritional deficiency, particularly in iron or folate, then improving your diet with nutrient-dense foods including beets could address the root cause. Telogen effluvium triggered by iron deficiency, for instance, often resolves once iron stores are replenished. In that case, beets are one piece of a broader dietary solution, not a hair treatment per se.
The way to distinguish between hair loss from nutritional deficiency and hair loss from other causes (genetics, hormones, autoimmune conditions, stress) is through blood work, not through trial-and-error with superfoods. If your ferritin, iron, folate, vitamin D, or zinc levels come back low, dietary changes and supplementation can make a real difference. If your levels are already normal, eating more of those nutrients is unlikely to push hair growth beyond its baseline. The body does not stockpile excess nutrients at the hair follicle for bonus growth; it simply excretes or downregulates absorption of what it does not need. This is why the “beets are packed with hair-healthy nutrients” framing, while technically true, overpromises in the absence of an actual deficiency to correct.