6 months ago I bought Natural calm plus calcium by natural vitality. It is supposed to be good at delivering the vitamins because its powder that you disolve in liquid.

It has Vit C 265 mg, Vit D3 105 IU, Calcium 210 mg, Magnesium citrate 320 mg, Potassium 105 mg, and Boron 265 mcg

For months now I have tried to take this supplement but it cause acid heartburn. I try with food, without, I try starting with only 1/2 tsp which is a small amount. Everything, to no avail. I really wanna take it cuz its supposed to be so good but I just get heartburn every time.

Anyone know which ingredient in this causes heartburn?

I have tried to research heartburn related to it but find nothing.