Devarol S injections to compensate for severe vitamin D3 deficiency. Devarol S vitamin D injections are among the most famous injections used for vitamin D deficiency. Many doctors prescribe them, especially in cases of severe vitamin D3 deficiency. Devarol S works to prevent complications of vitamin D deficiency in the body, and helps raise the level of vitamin D3. Devarol S is used from 3 to 6 months to obtain the best results.