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People with alopecia areata often have lower vitamin D levels, which are linked to more severe and longer-lasting hair loss, but vitamin D receptor levels in the skin don't show the same pattern and don't predict treatment success.

Vitamin D made by the skin plays a role in immune defense and skin health, and more research is needed to understand its full effects.

Low iron levels are a significant risk factor for hair loss, while high vitamin D levels might be a response to hair loss, not a cause.

People in Jeddah know about Vitamin D and its sources but are unclear on how much they need daily, and while many women take supplements, attitudes towards increasing Vitamin D levels vary.

The hair test for vitamin D could be a useful alternative to blood tests, providing a longer-term vitamin D status, but more research is needed.

The vitamin D receptor can work without its usual activating molecule.

People with alopecia areata often have other health issues like skin diseases, metabolic syndrome, stomach infections, lupus, anemia, thyroid problems, mental health issues, vitamin D deficiency, and hearing and eye problems.

Low vitamin D levels are linked to higher rates of hair loss in women.

1α,25-dihydroxyvitamin D3 directly affects cartilage growth and development.

The skin has multiple layers and cells, serves as a protective barrier, helps regulate temperature, enables sensation, affects appearance, and is involved in vitamin D synthesis.

Redheaded people may have evolved to efficiently make vitamin D in areas with less sunlight.

Men with hair loss may lack zinc, copper, and vitamin D; supplements could help.

A boy's hair loss improved after tumor removal and vitamin D treatment, but hair loss returned despite normal vitamin D and no tumor regrowth.

Redheaded people have higher levels of a vitamin D precursor, suggesting red hair may be an adaptation for better vitamin D synthesis in areas with less sunlight.

Hormones significantly affect skin health, with vitamin D playing a key role.

People with non-scarring hair loss often have lower vitamin D levels than those without hair loss.

Women with menstrual dysfunction often have deficiencies in magnesium, iron, and vitamin D.

The conference presented findings on how vitamin D levels, genetic factors, and lifestyle choices like smoking and yoga affect various health conditions and diseases.

Many young men with hair loss have low levels of vitamin D and B12.

Women with PCOS may have a higher risk of severe COVID-19 due to hormonal imbalances and vitamin D deficiency.

The study concluded that low iron and vitamin D levels in women might play a role in chronic hair loss, despite no significant difference between those with and without hair loss.

Older people tend to have higher biotin levels, which are weakly linked to certain blood components and negatively linked to triglycerides; biotin should be checked in patients with high triglycerides or medication-related skin issues, and only supplemented if deficient. Vitamin D and folate deficiencies are linked to specific skin conditions.

Hormones and metabolism play a complex role in prostate enlargement, and more research is needed to improve diagnosis and treatment.

Correcting nutrient deficiencies may help with hair loss, but the benefits of supplements without a deficiency are uncertain and could be harmful.

Testosterone treatment effectively causes male physical development in transgender male adolescents but may lead to side effects like acne, higher BMI and blood pressure, lower good cholesterol, and decreased bone density.

Hormones and their receptors, especially androgens, play a key role in hair growth and disorders like baldness.

Hormones and neuroendocrine factors control hair growth and color, and more research could lead to new hair treatment options.

Systemic diseases can cause hair loss, which is often reversible with treatment.

Men are more likely to have severe respiratory viral infections like COVID-19 due to hormonal and genetic differences, while women generally have stronger immune responses.

Hashimoto thyroiditis is an autoimmune disease that can lead to an underactive thyroid and is treated with medication and sometimes diet changes or surgery.