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This study found that 64.8% of patients with different types of alopecia had vitamin D deficiency, and those with lichen planopilaris and telogen effluvium had higher odds of severe deficiency compared to patients with alopecia areata.

This study confirmed that 25(OH)D3 can be detected in hair samples from healthy young adults, but no correlation was found between hair and serum 25(OH)D3 concentrations, indicating limited potential as a standalone biomarker.

This study observed no significant difference in vitamin D levels between children with alopecia areata and controls, but higher complete improvement in alopecia was noted among patients with vitamin D deficiency undergoing oral vitamin D treatment.

This study found that lower vitamin D levels were inversely associated with the severity of female pattern hair loss and patchy alopecia areata, but not with telogen effluvium.

This study suggests that vitamin D deficiency is likely not involved in the development of frontal fibrosing alopecia, as patients showed similar vitamin D levels to those with female pattern hair loss.

This study observed lower vitamin D levels in alopecia areata patients compared to healthy controls and suggested a possible causal role of vitamin D deficiency in the condition.

This study observed that women with PCOS had significantly lower serum vitamin D levels, which were associated with insulin resistance and other metabolic and hormonal imbalances.

This study found that patients with alopecia areata had significant systemic inflammation and vitamin D deficiency, with both conditions more pronounced as disease severity increased.

This study found no significant association between vitamin D intake or estimated vitamin D status and the risk of developing alopecia areata among women.

This study found that among Pakistani patients with diffuse hair fall, a significant 79.17% had vitamin D3 deficiency, suggesting that early recognition and treatment of this deficiency may help reduce hair loss.

This letter discusses the potential benefits of vitamin D supplementation for scarring and nonscarring alopecia but notes a lack of standard trials to support its use.

This study investigates differences in nutritional status, vitamin, and mineral levels between individuals with telogen effluvium and a control group, aiming to understand the nutritional factors involved in this condition.

This study found no significant association between the degree of male-pattern baldness and serum 25-hydroxyvitamin D levels in healthy middle-aged and older men.

This study found a significant association between lower vitamin D levels and increased severity of androgenetic alopecia in men.

This study found that Bangladeshi patients with type 2 diabetes mellitus had significantly lower serum vitamin E levels compared to healthy individuals, with lower levels particularly observed in female and older patients, emphasizing the potential importance of antioxidant status in managing the disease.

This study found that vitamin D levels were lower in alopecia areata patients, with trichoscopic features like broken hairs and black dots more prevalent in cases with vitamin D deficiency.

This study suggests that the role of vitamin 25(OH)D in the pathogenesis of PCOS and diminished ovarian reserve may be independent of serum vitamin 25(OH)D levels.

In this study, personalized treatment of folic acid and vitamin E deficiencies improved hair parameters in AGA patients, while Se supplementation might be unnecessary.

This study reported a significant association between cultural dress practices, reduced sunlight exposure, and symptoms of vitamin D and calcium deficiency among Muslim women in Coimbatore.

This study found that rural residents in the Erbil Governorate of Iraq had significantly higher vitamin D levels compared to urban residents, despite widespread awareness but limited preventive actions regarding vitamin D deficiency.

This study found that male patients with Androgenetic alopecia have higher serum leptin, lower vitamin D levels, and an altered adiponectin/leptin ratio, which may contribute to the disease's pathogenesis.

This study found that sheep with deficiencies in zinc, copper, and vitamin A exhibited symptoms like weight loss, skin disorders, and abnormal hematological and antioxidant enzyme levels compared to healthy sheep, suggesting that dietary supplementation of these nutrients could prevent these health issues.

This study found that while micronutrient abnormalities are common among patients receiving home parenteral nutrition, serious consequences from these abnormalities are rare.

This study assessed malnutrition among 657 internally displaced school-aged children in Cameroon, finding high rates of stunting (27.1%), wasting (23%), thinness (21.6%), underweight (20.1%), anemia (30%), low serum iron (44.5%), and poor protein status (35.7%), highlighting the urgent need for nutrition interventions.

This study observed that patients with alopecia had increased lipid peroxidation and decreased antioxidants, including lower beta-carotene, GSH levels, and GSH-Px activity, compared to healthy controls.

This study found that nutritional deficiencies and gastrointestinal abnormalities are uncommon in children with ichthyosis and growth failure, suggesting chronic hypovolemia may be more prevalent in this group.

This study found that lack of sleep, increased physical activity, and alopecia were associated with a higher risk of COVID-19 infection, while low-dose alcohol intake, hand hygiene, and daily fruit consumption were linked to reduced morbidity.

In this study, researchers found a significant relationship between mid-luteal progesterone levels and 25-hydroxy vitamin D levels in infertile patients, suggesting that about 20 ng/mL of vitamin D may be necessary to trigger ovulation or support progesterone secretion.

This study found that pediatric telogen effluvium in the US has varying triggers and management outcomes, with emotional stress and acute illness being the most common triggers.

This review synthesizes data suggesting that managing inflammation and oxidative stress may enhance the effectiveness of PRP therapy for hair regeneration, though standardizing PRP protocols remains challenging.