Low vit d level in report feeling week all the time takes long time to recover after any physical exercise, can it be low protien also?

Low protein and: or low vitamin B 12 are possibilities, especially if you are a vegetarian. Your doc can test you for these conditions. Have you began supplementing w/Vitamin D3? As your doc about the dose needed. Peace and good health.

Probably not protein: Your symptoms could be due to many conditions but at your young age low protein is not likely unless you are eating a very low protein diet. I would suggest a complete exam by your doctor and testing for anemia and thyroid disease. Make sure you are taking adequate vitamin D3 if it has been found to be low.