All minerals must be from a plant and the less processed the better. With calcium, normally the body has 900 times too much, so herbally you take silica to enable the body to use what it has accumulated, horsetail grass being the best. This is how Christopher came up with his calc tea formula. He used herbs high in plant calcium and horsetail grass for the high content of silica.

I use Epsom Salts on the garden to enrich the plants with magnesium, your plants can only draw out what is available to them. Many of the nuts have allot of magnesium and all your fruits and berries take longer to develope and use finer minerals, so they are always prefered choices. Magnesium is of no value if the body can not assimulate it. Many times taking a bath in Epsom Salts water raises the levels. Taking 1/4 tsp of Epsom Salts weekly seems to aid many, it cured my carpel tunnel many, many years ago! But always remember, the plant minerals are always better with far less side effects of accumulation.

Blessings,
MH