Caffeine increases excretion of calcium and magnesium [1]. This is why some caffeine pills are pressed with ~75mg calcium. Muscle tremors could be a sign of ma

Caffeine increases excretion of calcium and magnesium [1]. This is why some caffeine pills are pressed with ~75mg calcium. Muscle tremors could be a sign of magnesium and/or calcium deficiency, so it's likely that you were losing too many minerals and not making up for it in your diet. [1] https://www.ncbi.nlm.nih.gov/pubmed/7836625 https://www.ncbi.nlm.nih.gov/pubmed/7836625