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Amazon.com: Sunshine Naturals Vitamin D3 Dietary Supplement. Supports Bone Health and Improves Immune System. High Strength Formula. 250 mcg. 100 Softgels : Health & Household
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These softgels provide 5000 IU Vitamin D3; the activated form, and the nutrient helpful for a healthy immune system, strong bones, and smooth muscle functioning. – Nutrifactor
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Amazon.com: HUM Here Comes The Sun - Immune Supplement with Vitamin D & Calcium for a Healthy Immune System - Supports Radiant Skin, Mood + Bone Health (30 Softgels) : Health & Household
![Effect of sun exposure versus oral vitamin D supplementation on serum 25-hydroxyvitamin D concentrations in young adults: A randomized clinical trial - ScienceDirect Effect of sun exposure versus oral vitamin D supplementation on serum 25-hydroxyvitamin D concentrations in young adults: A randomized clinical trial - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0261561419301347-fx1.jpg)