Silica supplements, usually from the plant horsetail (Equisetum”> can increase the thickness of hair and help it maintain its strength and elasticity. Plant-based forms of silica have varied absorption rates. Choline-stabilised orthosilicic acid has been tested and demonstrated to be effective, but is more expensive.
Silica supplements should be used with caution: horsetail herb can cause liver damage and vitamin B1 deficiency if overused.
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