Vitamin d supplements deplete magnesium levels and i was looking for this format which is not available with chemists nearby. Glad to have found it at nykaa. Having 1 pill a day and have not experienced any side effects. It has helped reduced muscle pain. I am on my second bottle now. Will definitely repurchase. But a note of caution. Magnesium supplements may increase bleeding issues so use after doctor's consultation and keep an eye out for that issue.