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This study found that serum vaspin levels were elevated in women with polycystic ovary syndrome compared to controls, but treatment with metformin or weight loss did not significantly change these levels.

This study found that women with female-pattern hair loss had significantly lower serum levels of 25-hydroxyvitamin D compared to healthy controls, but it does not establish causation.

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 found that patients with age-related cataracts had significantly lower levels of manganese, selenium, vanadium, and zinc in their serum compared to healthy controls, with low serum selenium and zinc levels showing an independent association with an increased risk of cataracts.

This study found that lower serum BDNF levels were associated with higher depression severity and more severe alopecia areata in patients.

This study found that men with androgenetic alopecia had higher serum levels of testosterone and DHT compared to controls, suggesting a significant role of serum androgens in AGA development and progression.

This study found that patients with alopecia areata had significantly higher serum IL-1R1 levels, IL-1R1 gene expression, and hsa-miR-19b-3p levels compared to healthy controls, suggesting these could serve as diagnostic and prognostic markers for the disease's severity.

This study found that serum GPER-1 levels may serve as a biomarker for differentiating androgenetic alopecia from telogen effluvium and healthy controls, although its ability to distinguish between AGA and TE is limited.

This study found that patients with alopecia areata had higher serum levels of interleukin-17 and interleukin-23 compared to healthy controls, suggesting these cytokines may play a role in the disease's pathophysiology.

The study conducted at Al-Diwaniya Teaching Hospital found that patients with alopecia areata exhibited significantly higher serum levels of interleukin-17 and interleukin-23 compared to healthy controls, suggesting these cytokines might play a role in the disease's pathophysiology.

This study found that serum cysteine levels were not lower in patients with chronic telogen effluvium and did not correlate with hair loss severity.

This study found that serum GPER-1 levels were significantly higher in patients with androgenetic alopecia compared to healthy controls, suggesting a potential role in the condition's pathogenesis, independent of gender.

This study observed that a majority of female patients with chronic telogen effluvium had low serum ferritin levels without signs of clinical anemia, suggesting a possible link between low iron stores and hair loss.

This study found that individuals with alopecia areata had significantly lower vitamin D levels compared to healthy controls, and lower vitamin D levels were associated with more severe hair loss.

This study among ethnic Saudi Arabian women concluded that symptoms like muscle cramps, fatigue, mood swings, hair loss, back pain, and weight gain were more common in those with lower vitamin D levels.

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.

This study found that premenopausal women with female-pattern hair loss had significantly lower serum vitamin D levels compared to healthy controls, suggesting a potential role of vitamin D deficiency in this condition.

This study found that three genetic loci, including the newly identified JMJD1C, are associated with circulating testosterone and dihydrotestosterone levels, explaining a small portion of their variance in European men.

This study found that while serum zinc levels were lower in children treated with valproic acid or carbamazepine than in healthy controls, zinc, biotin, and biotinidase enzyme activity remained within normal ranges and unaffected by these treatments.

This study found that men with early-onset androgenetic alopecia and certain risk factors may have worse gonadal steroidogenesis and an increased likelihood of developing gonadal dysfunction, suggesting a male equivalent of polycystic ovarian syndrome.

In this case–control study, the researchers in Ukraine found no significant link between VDR rs2228570 polymorphism and decreased serum BDNF levels, though they observed a moderate correlation between serum BDNF and 25-OH Vitamin D levels in patients with thyroid disorders.

This study suggests that arginine and cysteine deficiency is not present in women with chronic telogen effluvium, indicating that amino acid supplementation may be unnecessary in nutrient-replete populations.

This study found that Egyptian women with frontal fibrosing alopecia had lower serum PPARγ levels and a higher occurrence of PPARG gene polymorphism compared to healthy controls, suggesting a potential role for PPARγ in the condition's development.

This study found that ferritin and cobalamin levels were better indicators than hemoglobin in assessing chronic nonscarring hair loss in females of reproductive age.

This case study reports the first known instance of adult Kawasaki's disease presenting with highly elevated serum ferritin levels and splenomegaly, emphasizing its consideration in differential diagnoses for adults with persistent rash, fever, and specific clinical features.

This study found that among men over 70, certain genetic variants associated with skin pigmentation affect serum PSA levels, with implications for how sun sensitivity and exposure may influence prostate cancer risk.