I've been taking cholecalciferol(vitamin d3) for6months. could taking it cause weird muscle pains&twitching (3months now)? i also take mg since 2month

Unlikely: Assuming your vitamin D levels are in the normal range, it is less likely that this supplementation is causing your muscle pains and twitching. Your twitches may be related to any number of reasons including stress, stimulant overuse (for example, caffeine), overexercise, or nutritional deficiencies. Here is some more information: http://www.nlm.nih.gov/medlineplus/ency/article/003296.htm