On nutrient content, the claim holds up. Peer-reviewed compositional reviews confirm the listed nutrients. Phytochemical investigations have demonstrated that M. oleifera leaves are a rich source of iron, phosphorous, calcium, potassium, fundamental amino acids, vitamin A and D, and antioxidant compounds such as phenolics, flavonoids and vitamin C . The leaves are rich in minerals like calcium, potassium, zinc, magnesium, iron and copper, and vitamins including beta-carotene, B vitamins, vitamin C, D and E are also present . Reported figures include roughly 2 mg/100 g iron and 25.5 to 31.03 mg/kg zinc , and one technical source notes that both dried and fresh leaves appear to contain substantial amounts of magnesium, iron, folate, and vitamins B-6, A, C and E relative to young children's needs . On amino acids, moringa leaf is described as containing the essential amino acids and has been proposed as a useful protein source for vegetarian diets .

On hair specifically, the evidence is early and mostly non-human. A systematic review published in the Journal of Drugs in Dermatology examined this exact question. It gathered preclinical and clinical data across major medical databases under PRISMA guidelines to assess the potential impact of Moringa-derived formulations on key hair parameters , and the journal's own summary states that translating these initial animal and early human findings into routine clinical care requires careful examination of the underlying methodology, sample sizes, and remaining clinical questions . The review's stated conclusion is direct: randomized controlled trials are necessary to establish whether Moringa is a suitable candidate for the management of hair growth, hair preservation, and hair loss .

The underlying primary studies are animal and laboratory work using topical moringa seed oil or leaf extract, not dietary moringa. Examples include a study in which moringa seed oil, traditionally used for hair loss with limited scientific evidence, was tested in cell-based and animal models and was found to up-regulate VEGF gene expression and down-regulate other hair-cycle factors , an anti-alopecia study of moringa seed oil in dihydrotestosterone-induced rabbits in which a 12.5% concentration showed the most activity on hair length and hair weight measures , and a study of moringa leaf extract on testosterone-induced alopecia in male albino rats . A consumer health review of the same topic reaches a similar bottom line: moringa supplements for hair growth are understudied .

On the deficiency link. The general premise that iron status relates to diffuse hair shedding has support. Low serum ferritin levels are significantly associated with telogen effluvium in women, and serum ferritin may serve as a useful biomarker for identifying iron deficiency in patients presenting with diffuse hair loss . However, that literature concerns iron status in general, not moringa.

A material caveat the post omits. Moringa's iron is not readily absorbed. Research reports that moringa leaves are rich in iron but also contain anti-nutritional compounds such as tannins, phytates and oxalates that inhibit mineral absorption, with iron bioavailability becoming low due to high phytic acid concentration . One study is titled outright "Iron Bioavailability from Moringa oleifera Leaves Is Very Low" . Similarly, traditional cooking techniques producing high-pH sauces compromise the bioavailability of iron and zinc from moringa , though processing such as blanching and dry-roasting can reduce anti-nutrient levels .