NutriStack
Alpha-GPC and Phosphatidylcholine, a caution.
Phosphatidylcholine and Alpha-GPC are both choline donors, so combining them raises total choline intake and the additive cholinergic and TMAO-generating load.
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 Phosphatidylcholine
- 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. Phosphatidylcholine and Alpha-GPC are both choline donors, so combining them raises total choline intake and the additive cholinergic and TMAO-generating load.
Mechanism. Both supplements deliver choline (phosphatidylcholine as a bound phospholipid, Alpha-GPC as glycerophosphocholine), so together they increase systemic choline available for acetylcholine synthesis and for gut microbial conversion to trimethylamine and hepatic oxidation to TMAO, raising cholinergic and metabolic exposure.
Recommendation. Avoid stacking high doses of both. If combining, keep total choline within reason and watch for cholinergic symptoms such as headache, nausea, sweating, or low mood. People prioritizing cardiovascular TMAO concerns should be especially cautious.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Alpha-GPC and Phosphatidylcholine 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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