Alpha-GPC vs Iodine (Potassium Iodide)
Nootropic vs Mineral · evidence-backed comparison
- • Iodine (Potassium Iodide) has the stronger evidence base (strong (multiple rcts / meta-analyses)).
- • Alpha-GPC has the broader effect profile across the 9 effect categories.
- • Iodine (Potassium Iodide) is cheaper per serving ($0.05 vs $0.70).
- • Alpha-GPC has a slightly cleaner safety profile.
Side-by-side traits
| Trait | Alpha-GPC | Iodine (Potassium Iodide) |
|---|---|---|
Category | Nootropic | Mineral |
Active compound | L-alpha-glycerylphosphorylcholine | Potassium iodide |
Form available | Capsule, Powder | Capsule, Tablet, Liquid |
Source | synthetic | mineral |
Typical dose | 300–600 mg | 150 mcg daily |
Dose range | 300–600 mg | 150–300 mcg |
Loading protocol | — | — |
Best taken with | with food | with food |
Best time of day | morning | morning |
Bioavailability How efficiently the body absorbs and utilizes the compound. | Very High (5/5) | Very High (5/5) |
Onset time | Acute: 60–90 min | Cumulative: 2–8 weeks |
Half-life | ~6 hours | — |
Evidence level Quality and quantity of human research. | Moderate (some RCTs) | Strong (multiple RCTs / meta-analyses) |
Overall effect Subjective effect magnitude. | Moderate (3/5) | Low (2/5) |
Muscle / strength | Moderate (3/5) | Very Low (1/5) |
Physical energy | Moderate (3/5) | Low (2/5) |
Focus / cognition | Very High (5/5) | Very Low (1/5) |
Mood / stress | Moderate (3/5) | Low (2/5) |
Sleep quality | Low (2/5) | Very Low (1/5) |
Immunity | Very Low (1/5) | Low (2/5) |
Recovery Post-exercise recovery support. | Low (2/5) | Very Low (1/5) |
Longevity / healthspan | Moderate (3/5) | Low (2/5) |
Safety rating 5 = exceptionally well-tolerated; 1 = significant risk profile. | High (4/5) | Moderate (3/5) |
Price per serving Approximate USD per typical daily dose. | $0.70 | $0.05 |
Vegan friendly | Yes | Yes |
Gluten free | Yes | Yes |
3rd-party tested | Yes | Yes |
About Alpha-GPC
The most bioavailable choline source for the brain. Boosts acetylcholine for focus, learning, and athletic power output.
About Iodine (Potassium Iodide)
Essential for thyroid hormone synthesis. Iodized salt usually covers needs; supplement only if confirmed deficient.
Vetted brands, third-party testing, ships worldwide.
Vetted brands, third-party testing, ships worldwide.
Alpha-GPC safety
Common side effects:
- • Headache
- • Heartburn
- • Insomnia (high doses)
Avoid if:
- • Stroke history (consult MD)
Drug interactions:
- • Anticholinergics
Iodine (Potassium Iodide) safety
Common side effects:
- • Acne
- • Hyperthyroidism (high doses)
- • Goitre (paradox)
Avoid if:
- • Hyperthyroid
- • Graves' disease
- • Hashimoto's (caution)
Drug interactions:
- • Lithium
- • Anti-thyroid drugs
Common uses
- • Focus
- • Memory
- • Power output
- • Cognitive aging
Stacks well with: Caffeine, Lion's Mane Mushroom
Common uses
- • Thyroid support
- • Pregnancy
- • Iodine deficiency
Stacks well with: Selenium (Selenomethionine)
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Medical disclaimer
SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements — especially if you are pregnant, breastfeeding, take prescription medication, or have a chronic condition.