Vitamin D2 Supplements May Reduce Vitamin D3 in Your Body

Key Takeaways

Vitamin D2 supplements may lower blood levels of vitamin D3, which the body uses more effectively.

Vitamin D2 comes from plants, while D3 is usually animal-based, making D3 harder to access for people on vegan or plant-based diets.

Adults need only 600–800 IU of vitamin D daily, and taking too much can cause serious side effects.

A new study suggests that vitamin D2 supplements may lower blood levels of vitamin D3, the form the body uses more effectively.

Some adults struggle to get enough vitamin D from food sources. Sunlight and supplements are important for keeping your bones, immune system, muscles, and nerves healthy.

What the Study Found

The new systematic review included 1,080 participants from 20 studies. Compared to participants who did not take supplements, t