NutriStack
Chromium and Vitamin B3, a synergy.
Combining niacin with chromium has been studied as a way to improve glucose handling. Controlled work in older adults found that niacin-bound or co-administered chromium produced greater improvements in glucose tolerance than chromium without niacin, consistent with niacin acting as part of the active chromium-nicotinate complex. This is generally a beneficial, additive relationship rather than a risk.
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
- Chromium and Vitamin B3
- Pair type
- Synergy
- Evidence (highest tier)
- Emerging
- 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 · Emerging evidence
Synergy
What is happening. Combining niacin with chromium has been studied as a way to improve glucose handling. Controlled work in older adults found that niacin-bound or co-administered chromium produced greater improvements in glucose tolerance than chromium without niacin, consistent with niacin acting as part of the active chromium-nicotinate complex. This is generally a beneficial, additive relationship rather than a risk.
Mechanism. Niacin (nicotinic acid) is a structural component of the biologically active chromium complex historically described as the glucose tolerance factor. In this role niacin appears to help chromium potentiate insulin signaling and improve cellular glucose uptake. The two nutrients act on the same insulin-sensitivity pathway rather than competing, so co-administration can enhance chromium's effect on glucose tolerance beyond chromium given alone.
Recommendation. For people specifically targeting glucose metabolism, taking chromium (typically 200 to 1000 mcg/day) together with a modest niacin intake is reasonable and may modestly enhance chromium's glucose effect. No timing separation is needed; they can be taken in the same dose. People on diabetes medication should monitor blood glucose, since improved glucose handling can add to the effect of those drugs.
Minimum separation. None required; can be taken together
Sources (2)
- Urberg M, Zemel MB. Evidence for synergism between chromium and nicotinic acid in the control of glucose tolerance in elderly humans. Metabolism, 1987.
- Reviews of chromium and the glucose tolerance factor in trace element nutrition and insulin sensitivity literature.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Chromium and Vitamin B3 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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