Nature Made® Vitamin D3 2000 IU (50 mcg) supports bone, teeth, muscle and immune health. Take one tablet daily to help raise and maintain healthy Vitamin D levels in the body.

The two major forms are vitamin D2 and vitamin D3. Vitamin D2 (ergocalciferol) is largely human-made and added to foods, whereas vitamin D3 (cholecalciferol) is synthesized in the skin of humans from 7-dehydrocholesterol and is also consumed in the diet via the intake of animal-based foods.

Where do you manufacture your products? All Nature Made® products are manufactured to meet our high quality standards. Most are manufactured at our very own facilities in beautiful Southern California and with our partners in Alabama.

Where Do Most Vitamin D3 Supplements Come From? Most vitamin D3 supplements come from two animal sources: fish oils (from the skin of fatty fish) or sheep lanolin (the waxy substance secreted by the glands in sheep skin). If you're vegan or vegetarian, then neither of those will work.

However, taking too much vitamin D in the form of supplements can be harmful. Children age 9 years and older, adults, and pregnant and breastfeeding women who take more than 4,000 IU a day of vitamin D might experience: Nausea and vomiting. Poor appetite and weight loss.

“Vitamin D3 is essential for the absorption and utilization of calcium and phosphorus, which are vital for maintaining strong and healthy bones,” says Sam Schleiger, a functional medicine dietitian and founder of Simply Nourished, a nutrition practice in Elkhorn, Wisconsin.

Summary: Best Vitamin D Supplements

There are quite a few differences between vitamin D and vitamin D3, but the main difference between them is that vitamin D is a fat-soluble vitamin that regulates calcium and phosphorous levels in the body, whereas the vitamin D3 is the natural form of vitamin D produced by the body from sunlight.

Nature Made®, the supplement brand marketed by Otsuka Pharmaceutical Co., Ltd.

A: Nature Made products are not manufactured in China. Nature Made Zinc 30 mg Tablets are manufactured and quality tested in the United States at our facilities in California and Alabama.

When choosing a supplement, be aware that some types of vitamin D are not vegan-friendly. Vitamin D2 is always suitable for vegans, but vitamin D3 can be derived from an animal source (such as sheep's wool) or lichen (a vegan-friendly source).

As explained in the What It Is section of the Vitamin D Supplements Review, vitamin D3 in most supplements has been chemically converted from a compound in lanolin, while that in fish oil is naturally produced (also by conversion of the same compound).