To know the exact amount of Vitamin D3 you need, you should perform a blood test. Get your blood results before you start supplementing and three months into supplementation. This will help you to find out if you have reached a desirable blood levels and if the dose you are taking is enough for you.
Nevertheless, you may want to supplement if you have a dark skin completion and live in the Northern hemisphere. People suffering with colds and flu, herpes and are depressed should also consider supplementation. People with auto-immune disease and following a vegan diet may want to supplement too with Vitamin D3.
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