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In this case report, an 80-year-old woman experienced darkening of previously grey hair, which may be linked to vitamin B supplementation, though its effectiveness is typically associated with reversing greying only in the presence of an initial vitamin B deficiency.

This study observed that patients with hypothyroidism-associated hair loss commonly have deficiencies in several vitamins and minerals, suggesting that these deficiencies may be linked to their condition.

In this study conducted in Jazan, Saudi Arabia, most participants were aware of vitamin D, zinc, and ferritin deficiencies and their link to hair loss, but only about a third practiced daily sun exposure and vitamin supplement use, highlighting a need for improved health education.

This study found that COVID-19 vaccination initially lowered vitamin D levels in serum and hair but increased serum levels after the second dose, except for the Pfizer group. Hair vitamin D showed a nonsignificant increase, and hair loss was most common with the AstraZeneca vaccine.

This study found that while calcium can substitute for the Vitamin D receptor in maintaining epidermal keratinocyte differentiation, it cannot compensate for hair follicle dysfunction caused by the absence of the receptor.

This study found that feeding mice high levels of dietary vitamin A increased WNT signaling, which activated hair follicle stem cells and may have accelerated alopecia areata progression.

This study found that 66% of patients with hair loss also have vitamin D deficiency, with a significantly higher prevalence among women than men.

This study observed that the vitamin D receptor is crucial for hair follicle formation and altering tumor development in the Wnt signaling pathway, suggesting therapeutic potential for vitamin D analogues in related tumors.

This study suggests that while VDR is crucial for maintaining hair follicles in mice, their degeneration may be linked to impaired cell migration during hair growth phases rather than stem cell loss.

This study found that female students experiencing diffuse hair fall had significantly lower Vitamin D3 levels compared to healthy controls.

This review discusses vitamin D's role in hair follicle biology and its association with hair loss but reports no conclusive evidence for its effectiveness as a treatment, indicating the need for further studies.

Using minoxidil and tretinoin on the skin, along with oral vitamin D, improved hair thickness and density in two girls with woolly hair.

In this case study, a 45-year-old woman's hair loss improved after three months of weekly high-dose vitamin D supplementation, emphasizing the importance of assessing vitamin D levels in patients with hair loss.

This study found that vitamin D supplementation in diets of Rex rabbits improved hair follicle development and fatty acid metabolism, with 1400–2100 IU/kg proving most effective for hair density and 2800 IU/kg increasing hair length.

This review reports that vitamin D plays an important role in hair follicle development, with a negative correlation observed between serum vitamin D levels and female pattern hair loss, suggesting further research is needed before recommending vitamin D as a treatment.

This study investigated the role of the ABCA4 gene in human keratinocytes and hair follicle stem cells and found that silencing the ABCA4 gene increases the harmful effects of all-trans-retinal on hair follicle stem cells.

This study suggests that excess dietary vitamin A may arrest hair follicles in refractory telogen in mice, while adequate levels promote competent telogen, revealing dose-dependent effects on hair cycling.

This study observed that serum Vitamin D3 levels were low among South Indian students with diffuse hair fall, highlighting global hypovitaminosis D as a concern and suggesting possible dietary or sunlight exposure influences.

The vitamin D receptor helps control hair growth and may protect against certain skin tumors.

Active vitamin D3 might protect hair follicles from radiation damage.

This study found that a supplement containing medicinal plant extracts, amino acids, and vitamins decreased hair loss and increased hair thickness over three months, without significant side effects, in participants with hair loss concerns.

This study found that a combination of vitamins in hair care products promoted hair shaft elongation in a mouse model by activating the PlGF/VEGFR-1 signaling pathway.

This study found that primary health physicians in Saudi Arabia generally have low knowledge and practice scores regarding the use of vitamins and minerals for treating hair loss, with no significant difference between more or less experienced doctors.

This article discusses the relationship between vitamins and scalp hair loss but does not report new clinical results.

This study found that using conditioned medium from vitamin D3 pre-activated preadipocytes enhanced hair regeneration in mice by promoting angiogenesis.

This report suggests that correcting nutritional deficiencies may improve hair quality in patients with Monilethrix and similar hair shaft disorders, though it is not a cure.

This study found a significant decline in serum zinc levels among women of African descent using hair relaxers and experiencing alopecia, with age at first exposure potentially influencing alopecia development.

Non-drug methods like diet, supplements, and aromatherapy can help manage hair loss and its emotional impact.

This study found that treating human hair with vitamin E and γ-oryzanol significantly reduced UV-B-induced structural damage, with γ-oryzanol providing greater protection, especially in female hair samples. The findings highlight these compounds' potential as cost-effective solutions for preserving hair integrity against UV damage.

This study found that a supplement containing cystine, B vitamins, and minerals improved hair condition in 34 women with diffuse hair loss over six months, as evidenced by an increased anagen/telogen hair ratio, positive participant feedback, and no serious side effects.