I have a vitamin d level of 15.8 ng/ml. do I have to start taking supplements and if yes at what interval 8 should take

A. Actually take vitamin D supplement for grown-up it’s basically like once in a week that you have to take for three months so depending upon which one is going to be best for you what should be the IU of the medicine accordingly should proceed with mostly suggested 60,000 but you have to check with your doctor before you take it