Silica, absorbed in a soluble form, is a trace mineral in connective tissue. Its most credible benefits are stronger hair, skin, and nails, mostly in women. Bone benefits are biologically reasonable but mixed and unconfirmed by large trials. The oral supplement is well tolerated and inexpensive; effects are gradual and modest. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Bone mineral density (DEXA T-score) | Above -1.0 (normal) | Tracks the primary bone outcome silica is taken to support |
| eGFR (estimated kidney filtration) | >90 mL/min/1.73 m² | Silicon is renally cleared; confirms safety of supplementation |
| Serum P1NP (type-1 collagen formation marker) | Mid-to-upper reference range | Bone-formation marker that rose in the ch-OSA bone trial |
| Serum CTX (type-1 collagen breakdown marker) | Lower half of reference range | Bone-resorption marker; balances P1NP for net bone turnover |
| 25-hydroxy vitamin D | 40–60 ng/mL | Co-nutrient essential for the bone benefit silica is meant to add to |
Cadence: Bone turnover markers at ~6–12 months and bone density every 1–2 years; eGFR every 6–12 months for those with kidney concerns. No routine monitoring for skin/hair/nail use.