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The answer is - Silicea.
What is silicic earth / silicic acid?
From rock crystal to diatoms – it is all around us.
In combination with water, it is referred to as silicic acid. This is found in the structures of tiniest marine organisms, the diatoms, which already existed in the earth’s original ocean, the “Urmeer”, 80 million years ago. The skeletal structures of the dead diatoms settled on the ocean floor, accumulatingto form huge deposits.
What makes silicon dioxide and silicic acid so special is their high binding capacity.
Colloidal Structure – The particle size makes all the difference
Silicic acid tends to form very large particle complexes that are difficult to absorb by the human body. Contrary to siliceous earth, silicic acid gel contains silicic acid particles, a compound of silicon, oxygen, and water, in microdispersed (colloidal) form.
This colloidal form describes a state between solid and liquid. This means that silicic acid particles can form a compound with water without fully dissolving in it. The colloid contains tiny particles of silica. The small particle structure facilitates penetration of the intestinal wall and absorption. Thus silicic acid and the silica contained therein can be utilized optimally well by the human body.
The major difference between the powder form of siliceous earth and the liquid form of silicic acid gel is the size of the particles within the compounds.
In the gel, they are 1800 times smaller than in siliceous earth. The effect is comparable with a gym ball rather than a grain of sand trying to pass through the intestinal wall to reach its destination.