Silicon and Collagen

Silicon is the element behind the Institute's 2021 essay title "Adding Quartz to Human Cells" — a deliberately startling way into a real and unglamorous piece of connective-tissue biology.

Quartz is not the point. Silicon dioxide as mineral is biologically inert and, as respirable dust, is the cause of silicosis. The bioavailable species is orthosilicic acid (H₄SiO₄) — soluble monomeric silicon, the only form absorbed in the gut. Everything useful about dietary silicon runs through that molecule; polymerised silica does nothing.

What it does

Silicon is implicated in the cross-linking and stabilisation of collagen and in the formation of glycosaminoglycans — the ground substance of connective tissue. It appears to act as a cofactor in prolyl hydroxylase activity, the enzyme step that makes collagen a stable triple helix. That places it upstream of skin, bone matrix and vessel wall integrity.

This is the mainstream nutritional position, presented as physiology rather than as a cure. Silicon has not been established as an essential nutrient in humans — no deficiency disease is defined and no requirement is set — though it is essential in chicks and rats.

Sources

Horsetail (Equisetum arvense) — the traditional silica-rich plant, and the one the essay names.
Beer — genuinely one of the largest dietary sources in Western diets, because barley silicon is soluble.
Whole grains, bananas, green beans, and drinking water in some regions.
Choline-stabilised orthosilicic acid (ch-OSA / BioSil) — the supplement form with the human trial data; the choline stabilisation exists to keep the silicic acid from polymerising in the bottle.

Evidence

Framingham Offspring — dietary silicon intake associated with higher hip bone-mineral density in men and premenopausal women. Observational.
Small ch-OSA trials report improvement in skin, hair and nail parameters and in bone markers alongside calcium and D. Small, and several are industry-funded.

Cautions

Horsetail contains thiaminase, which degrades vitamin B1. Prolonged use has caused thiamine deficiency in grazing livestock; supplement products are usually treated to inactivate it, and unprocessed herb should not be taken long-term without B1.
Horsetail is a diuretic and some species accumulate nicotine and heavy metals; Equisetum arvense must be distinguished from E. palustre, which is toxic.
Do not inhale silica powder — silicosis is real and irreversible. The essay's title is a metaphor.