Zeolite (Clinoptilolite)

Zeolite (Clinoptilolite) is not a food or nutritional substance in the conventional sense; it is a naturally occurring microporous aluminosilicate mineral with the approximate chemical formula (Na,K,Ca)₂–₃Al₃(Al,Si)₂Si₁₃O₃₆·12H₂O. It does not provide macronutrients (no protein, fat, carbohydrates, or caloric energy). Its relevance lies in its mineral composition and unique physicochemical properties. Key constituents include: SiO₂ (silicon dioxide): ~65–72% by weight; Al₂O₃ (aluminum oxide): ~11–14%; CaO (calcium oxide): ~2–5%; K₂O (potassium oxide): ~1–4%; Na₂O (sodium oxide): ~0.5–2%; MgO (magnesium oxide): ~0.5–1.5%; Fe₂O₃ (iron oxide): ~0.5–2%; TiO₂ (trace). The bioactive mechanism is not nutrient-based but rather ionic: clinoptilolite possesses a high cation exchange capacity (CEC) of approximately 150–230 meq/100g, enabling it to selectively bind heavy metals (Pb²⁺, Cd²⁺, Hg²⁺, As³⁺) and ammonium ions (NH₄⁺) within its cage-like crystalline lattice (pore size ~4–7 Å). It may release small amounts of exchangeable cations such as Ca²⁺, Mg²⁺, K⁺, and Na⁺ into the GI tract during ion exchange, though bioavailability of these released minerals is modest and incidental. Silicon released as orthosilicic acid from partial dissolution may contribute trace bioavailable silicon (~1–5 mg per typical dose). Contains no vitamins, no fiber, no amino acids, and no significant bioactive organic compounds. Typical supplemental doses range from 1–5 g/day of micronized or tribomechanically activated clinoptilolite powder. Importantly, the aluminum within the intact aluminosilicate framework is tightly bound and is generally not bioavailable when the zeolite structure remains intact; studies on micronized clinoptilolite (PMA-zeolite) suggest negligible aluminum absorption. The primary functional value is as an adsorbent and ion-exchanger rather than a nutrient source.