I recently started a supplement and dietary regimen to reverse my osteoporosis and heal my tooth decay. I have been taking a plant-based calcium supplement that contains K1 and K2, some D3 (400 IU), and a bit of strontium (5mg) and something else I can't recall right now. In addition, I have been taking 1000 IU of D3 and vitamin E. But for the past few days, soon after taking my supplements (after breakfast), I either get very fatigued or I get lightheaded and dizzy. I've also been experiencing a lot of gas, constipation, dry mouth occasionally. Could it possibly be the D3? Is it possible I don't need to supplement it? I find this hard to believe, since I'm a 59 year old female who lives in the Pacific NW. But it's odd how the symptoms come on soon after taking my supps and last almost all day!