Vitamin D3 (cholecalciferol) is most well known for promoting bone health.

Bone Health

Vitamin D3 plays a crucial role in the formation and maintenance of strong, healthy bones.

However, there is no consensus on how best to use vitamin D3 to prevent or treat autoimmune diseases.

A man poured vitamin D3 capsules from a plastic bottle into his palm

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Mental Health

Low vitamin D levels are associated with increased symptoms ofdepression and anxiety.

Cardiovascular Health

Adequate vitamin D levels are crucial for preventing calcium imbalances.

In severe cases, imbalanced calcium levels can lead to severe heart complications and may contribute to heart disease.

Vitamin D3 offers numerous benefits for skin.

Cognitive Function

Vitamin D3 is thought to have many benefits for your brain and cognitive health.

Digestive Health

A growing body of research shows that vitamin D supplementation has positive benefits for digestive health.

Having a reduced level of vitamin D is also a risk factor for worsened IBD symptoms.

Keep in mind that taking 50,000 IU of vitamin D per week is well over the recommended daily intake.

The maximum safe dose of vitamin D supplementation is 4,000 IU per day.

Do not exceed this amount unless supervised by a healthcare provider.

Hair Loss Prevention

Vitamin D deficiency has been linked to several hair loss disorders, includingtelogen effluviumandalopecia areata.

It has also been linked to scarring alopecia, a disorder that results in permanent hair loss.

Vitamin D is a general term that refers to both vitamin D2 and vitamin D3.

Vitamin D2 comes from mushrooms and fortified foods.

Vitamin D3 From the Sun

The compound7-dehydrocholesterolin the skin converts UVB light into vitamin D3.

Production varies by age and skin tone, with older adults and those with darker skin producing less.

Sunscreen reduces vitamin D3 production by blocking UV rays but protects against skin cancer.

Who Should Use Vitamin D3 Supplements?

Vitamin D3 is available in capsules, softgels, gummies, and liquid drops.

Consult your healthcare provider for the best dosage based on your age and medical history.

The majority of vitamin D intake should come from food.

Symptoms of Vitamin D3 Deficiency

Not everyone with vitamin D deficiency experiences symptoms.

Vitamin D3 is a fat-soluble vitamin.

This means that taking it with fat helps it absorb better.

This is referred to ashypervitaminosisD.

With vitamin D toxicity, the balance of minerals like calcium and potassium is upset.

This can lead to a condition known ashypercalcemia, in which too much calcium builds up in the body.

Summary

Vitamin D helps you absorb calcium and phosphate from food.

It is important for bone and muscle strength, immune function, and healthy skin.

It may also help prevent numerous diseases, including inflammatory bowel disease, heart disease, and infectious diseases.

Talk to your healthcare provider if you have a medical condition that might benefit from taking vitamin D3 supplements.

The upper limit for safe vitamin D supplementation is 4,000 IU per day.

Do not take more than this unless directed by your healthcare provider.

Bocheva G, Slominski R, Slominski A.The impact of vitamin D on skin aging.Int J Mol Sci.

2023 Jun;15(11):2419. doi:10.3390/nu15112419

U.S. Food and Drug Administration.Questions and answers on dietary supplements.

A systematic review and meta-analysis.Int J Older People Nurs.

2023;18(1):e12492.

2018 Jul;10(7):e2960.

2024;14(1):35. doi:10.1038/s41387-024-00296-0

National Cancer Institute.Vitamin D and cancer.

2023;21(11):1172-1180.e3.

2021;13(4):e14688.

2023;12(3):893. doi:10.3390/jcm12030893

Harvard T.H.

2024;16(14):2352. doi:10.3390/nu16142352

National Organization for Rare Disorders.Vitamin D deficiency rickets.

2021;14:3357-3381. doi:10.2147/RMHP.S316897

National Kidney Foundation.Vitamins and minerals in chronic kidney disease.

2021;109(2):157-178.