NutriStack
Alpha-GPC and Citicoline, a caution.
Both are potent choline sources. Taking both at full doses may provide excessive choline, potentially causing headaches, GI distress, or fishy body odor.
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
- Alpha-GPC and Citicoline
- Pair type
- Caution
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Caution · Moderate evidence
Caution
What is happening. Both are potent choline sources. Taking both at full doses may provide excessive choline, potentially causing headaches, GI distress, or fishy body odor.
Mechanism. Both are highly bioavailable choline donors. Citicoline provides ~18% choline by weight, Alpha-GPC ~40%. Combined full doses may exceed the 3.5g/day upper limit for choline.
Recommendation. Choose one or reduce doses of both. Rarely needed to stack both choline sources simultaneously.
Sources (2)
- Zeisel SH. Choline: critical role during fetal development and dietary requirements in adults. Annu Rev Nutr. 2006. PMID 16848706
- Sagaro GG, Traini E, Amenta F. Activity of Choline Alphoscerate on Adult-Onset Cognitive Dysfunctions: A Systematic Review and Meta-Analysis. J Alzheimers Dis. 2023. PMID 36683513
Stack Score
How this pair moves the number.
Effect on the composite score
If both Alpha-GPC and Citicoline are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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