Tag: Oral spray absorption

According to research published in the *Nutrition Journal*, the number of sprays for vitamin D supplementation is not a fixed universal amount but is dependent on the product's specific concentration of International Units (IU) per spray. This means checking the product label is essential for correct usage.

Studies have shown that oral vitamin D sprays can significantly increase serum levels within as little as three days for those who are deficient. But many people still wonder, how long does vitamin D spray take to work for noticeable, long-term health improvements?