Vitamin D3 appears to be more effective at increasing vitamin D levels than vitamin D2 according to a recent study: From MedicalNewsToday: Vtiamin D Guidelines May Be Changing Following New Study

An excerpt:

The researchers measured vitamin D levels in 335 South Asian and white European women over two winter periods. They chose winter because, due to a reduction in sunlight exposure, vitamin D levels tend to be lower at this time.

The women were split into five groups: those consuming vitamin D-2 in a biscuit; those consuming vitamin D-3 in a biscuit; those consuming vitamin D-2 in a juice drink; those consuming vitamin D-3 in a juice drink; and those receiving a placebo.

The study found that vitamin D-3 was twice as effective at raising vitamin D levels in the body as vitamin D-2.

Participants who received the D-3 in a biscuit raised their levels of vitamin D by 74 percent, while those receiving the vitamin in juice saw a 75 percent increase. Those receiving D-2 had a 33 and 34 percent increase, respectively. The placebo group experienced a drop of 25 percent across the same period.

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