NutriStack
Spirulina and Vitamin C, a synergy.
Vitamin C taken with spirulina improves absorption of spirulina's non-heme iron, supporting its use for iron status.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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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
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 2 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. Vitamin C taken with spirulina improves absorption of spirulina's non-heme iron, supporting its use for iron status.
Mechanism. Ascorbic acid reduces ferric iron to the more soluble ferrous form and forms an absorbable iron-ascorbate complex, enhancing intestinal uptake of the non-heme iron found in spirulina.
Recommendation. Take spirulina with a vitamin C source or supplement to maximize iron uptake. This is a helpful pairing for plant-based iron support.
Sources (2)
- Hallberg L, Hulthen L, Prediction of dietary iron absorption: an algorithm for calculating absorption and bioavailability of dietary iron, American Journal of Clinical Nutrition, 2000
- Selmi C et al., The effects of Spirulina on anemia and immune function, Cellular and Molecular Immunology, 2011
Stack Score
How this pair moves the number.
Effect on the composite score
If both Spirulina and Vitamin C 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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