NutriStack
Silicon and Vitamin D3, a synergy.
Human and mechanistic data support a complementary, bone-building relationship rather than any adverse interaction. In a 12-month randomized, placebo-controlled trial in osteopenic women, choline-stabilized orthosilicic acid added on top of daily calcium plus Vitamin D3 produced a significantly greater rise in the bone-formation/type I collagen marker PINP than calcium plus Vitamin D3 alone, at silicon doses of roughly 6 to 12 mg per day. This reflects silicon strengthening the collagen scaffold that Vitamin D3-driven mineralization then fills, so the pair is genuinely additive for bone matrix quality.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Silicon and Vitamin D3
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Synergy · Moderate evidence
Synergy
What is happening. Human and mechanistic data support a complementary, bone-building relationship rather than any adverse interaction. In a 12-month randomized, placebo-controlled trial in osteopenic women, choline-stabilized orthosilicic acid added on top of daily calcium plus Vitamin D3 produced a significantly greater rise in the bone-formation/type I collagen marker PINP than calcium plus Vitamin D3 alone, at silicon doses of roughly 6 to 12 mg per day. This reflects silicon strengthening the collagen scaffold that Vitamin D3-driven mineralization then fills, so the pair is genuinely additive for bone matrix quality.
Mechanism. Silicon (as orthosilicic acid) stimulates type I collagen synthesis and osteoblast differentiation, building the organic collagen scaffold of bone, while Vitamin D3 drives intestinal calcium absorption and matrix mineralization. The two act on complementary, sequential steps of bone formation: silicon lays down and cross-links the collagen matrix, and Vitamin D3 (with calcium) mineralizes it.
Recommendation. Reasonable to take together for bone and connective tissue support. Typical doses: silicon as orthosilicic acid or stabilized silica around 5 to 10 mg elemental silicon per day, with Vitamin D3 around 800 to 2000 IU (20 to 50 mcg) per day, alongside adequate calcium. No timing separation is needed; both can be taken with a meal. Silicon is best regarded as an adjunct to, not a replacement for, calcium and Vitamin D3.
Minimum separation. None required
Sources (3)
- Spector et al., Choline-stabilized orthosilicic acid supplementation as an adjunct to calcium/vitamin D3 stimulates markers of bone formation in osteopenic females: a randomized, placebo-controlled trial, BMC Musculoskeletal Disorders, 2008
- Jugdaohsingh, Silicon and bone health, Journal of Nutrition, Health and Aging, 2007
- Rondanelli et al., Silicon: a neglected micronutrient essential for bone health, Experimental Biology and Medicine, 2021
Stack Score
How this pair moves the number.
Effect on the composite score
If both Silicon and Vitamin D3 are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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