L-Theanine vs Magnesium Citrate
Nootropic vs Sleep · evidence-backed comparison
- • L-Theanine has the broader effect profile across the 9 effect categories.
- • L-Theanine has a slightly cleaner safety profile.
- • L-Theanine has higher bioavailability (better absorption).
Side-by-side traits
| Trait | L-Theanine | Magnesium Citrate |
|---|---|---|
Category | Nootropic | Sleep |
Active compound | L-theanine | Magnesium citrate |
Form available | Capsule, Powder | Capsule, Powder, Tablet, Liquid |
Source | plant | synthetic |
Typical dose | 100–400 mg | 200–400 mg elemental Mg |
Dose range | 100–400 mg | 200–400 mg |
Loading protocol | — | — |
Best taken with | caffeine (1:2 ratio) | any time, with water |
Best time of day | any | any |
Bioavailability How efficiently the body absorbs and utilizes the compound. | Very High (5/5) | High (4/5) |
Onset time | Acute: 30–60 min | Acute: 1–3 hours |
Half-life | ~3 hours | — |
Evidence level Quality and quantity of human research. | Moderate (some RCTs) | Moderate (some RCTs) |
Overall effect Subjective effect magnitude. | Moderate (3/5) | Moderate (3/5) |
Muscle / strength | Very Low (1/5) | Low (2/5) |
Physical energy | Low (2/5) | Low (2/5) |
Focus / cognition | High (4/5) | Very Low (1/5) |
Mood / stress | High (4/5) | Low (2/5) |
Sleep quality | Moderate (3/5) | Moderate (3/5) |
Immunity | Low (2/5) | Very Low (1/5) |
Recovery Post-exercise recovery support. | Very Low (1/5) | Low (2/5) |
Longevity / healthspan | Low (2/5) | Moderate (3/5) |
Safety rating 5 = exceptionally well-tolerated; 1 = significant risk profile. | Very High (5/5) | High (4/5) |
Price per serving Approximate USD per typical daily dose. | $0.12 | $0.12 |
Vegan friendly | Yes | Yes |
Gluten free | Yes | Yes |
3rd-party tested | Yes | Yes |
About L-Theanine
Green tea amino that produces calm focus by raising alpha brain waves. Pairs perfectly with caffeine to take the edge off without sedation.
About Magnesium Citrate
Most affordable absorbable magnesium. Doubles as a mild laxative — useful if constipated, less ideal if not.
Vetted brands, third-party testing, ships worldwide.
Vetted brands, third-party testing, ships worldwide.
L-Theanine safety
Common side effects:
- • Generally none
Avoid if:
- • Low blood pressure
Drug interactions:
- • Blood pressure meds
Magnesium Citrate safety
Common side effects:
- • Loose stools (often desired)
- • GI cramps
Avoid if:
- • Severe kidney disease
Drug interactions:
- • Bisphosphonates
Common uses
- • Calm focus
- • Anxiety reduction
- • Better sleep onset
Stacks well with: Caffeine
Common uses
- • General magnesium repletion
- • Constipation
- • Sleep
Stacks well with: Vitamin D3
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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.