I didn't realize I might be low in Calcium all these years. I do not consume any dairy products due to intolerance and it never occurred to me that I may be low in Calcium. It could explain my spinal pain, tremors, cognitive impairment, and heavy bleeding. I noticed when I take Magnesium I feel very unwell. My heart slows to a crawl. I want to incorporate calcium in my regimen but want to use the Calcium Hydroxyapatite form from cow bones. Does anyone know how much one would need to take if one is extremely low in calcium? I have the KAL bone meal powder and it gives around 1300mg calcium per teaspoon. After this bottle, I will move on to Now Foods Calcium hydroxyapatite which is a better product. I will be taking with Vitamin D3 drops. Thanks!