Safety Profile
Overall safety rating: Generally Safe
Alpha-GPC Side Effects & Safety
This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer
Potential Side Effects
- Headache (often from excess acetylcholine — reduce dose)
- Digestive upset, nausea, or diarrhea at higher doses
- Fishy body odor from choline metabolism (trimethylamine)
- Rare: dizziness or insomnia
- Potential concern: large observational study (2021) linked chronic high-dose choline supplements to increased stroke risk — further research needed
Drug & Supplement Interactions
- Anticholinergic medications — Alpha-GPC may counteract their therapeutic effects
- Cholinesterase inhibitors (donepezil, rivastigmine) — additive cholinergic effects, risk of cholinergic crisis
- Scopolamine — Alpha-GPC may reduce its efficacy
Maximum Dose
Do not exceed: 1200mg/day (prescription doses in Europe)
References
- De Jesus Moreno M (2003). Cognitive improvement in mild to moderate Alzheimer's dementia after treatment with the cholinergic precursor choline alfoscerate. Clinical Therapeutics. DOI PubMed
- Ziegenfuss T, Landis J, Hofheins J (2008). Acute supplementation with alpha-glycerylphosphorylcholine augments growth hormone response to, and peak force production during, resistance exercise. Journal of the International Society of Sports Nutrition. DOI
- Kawamura T, Okubo T, Sato K, et al. (2012). Glycerophosphocholine enhances growth hormone secretion and fat oxidation in young adults. Nutrition. DOI PubMed