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Plus, all Vitacost supplements adhere to the FDAs Current Good Manufacturing Practices (CGMPs), ensuring that they are manufactured to high standards of POTENCY, PURITY, efficacy and safety. Silica from Horsetail Extract is a high-quality extract of horsetail herb, standardized to the active ingredient silica (an organic form of the mineral silicon). Vitacost-Synergy Silica from Horsetail Extract 240 Tablets Whether youre shopping Vitacost vitamins, minerals, herbs or other key nutrients, their potency is guaranteed whats on the label is whats in the bottle. Synergy from Horsetail Extract is a targeted wellness solution - just for you.