Glycine vs L-Carnitine (Tartrate)
Sleep vs Performance · evidence-backed comparison
- • L-Carnitine (Tartrate) has the broader effect profile across the 9 effect categories.
- • Glycine is cheaper per serving ($0.10 vs $0.60).
- • Glycine has a slightly cleaner safety profile.
- • Glycine has higher bioavailability (better absorption).
Side-by-side traits
| Trait | Glycine | L-Carnitine (Tartrate) |
|---|---|---|
Category | Sleep | Performance |
Active compound | Glycine | L-carnitine L-tartrate |
Form available | Powder, Capsule | Powder, Capsule, Liquid |
Source | synthetic | synthetic |
Typical dose | 3 g before bed | 1–3 g daily |
Dose range | 3–5 g | 1–3 g |
Loading protocol | — | — |
Best taken with | water, 30 min before bed | carbs (improves absorption) |
Best time of day | evening | post-workout |
Bioavailability How efficiently the body absorbs and utilizes the compound. | Very High (5/5) | Moderate (3/5) |
Onset time | Acute: 30–60 min | Cumulative: 4–12 weeks |
Half-life | ~1 hour | ~15 hours |
Evidence level Quality and quantity of human research. | Moderate (some RCTs) | Moderate (some RCTs) |
Overall effect Subjective effect magnitude. | Low (2/5) | Low (2/5) |
Muscle / strength | Low (2/5) | Moderate (3/5) |
Physical energy | Very Low (1/5) | Moderate (3/5) |
Focus / cognition | Low (2/5) | Low (2/5) |
Mood / stress | Moderate (3/5) | Low (2/5) |
Sleep quality | High (4/5) | Very Low (1/5) |
Immunity | Very Low (1/5) | Very Low (1/5) |
Recovery Post-exercise recovery support. | Low (2/5) | High (4/5) |
Longevity / healthspan | Moderate (3/5) | 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. | $0.10 | $0.60 |
Vegan friendly | Yes | No |
Gluten free | Yes | Yes |
3rd-party tested | Yes | Yes |
About Glycine
Sweet-tasting amino that lowers core body temperature for deeper sleep. Cheap, well-tolerated, and especially useful with magnesium glycinate.
About L-Carnitine (Tartrate)
Shuttle for fatty acids into mitochondria. Modest fat-burning effects; stronger evidence for recovery and androgen receptor density.
Vetted brands, third-party testing, ships worldwide.
Vetted brands, third-party testing, ships worldwide.
Glycine safety
Common side effects:
- • Generally none
Avoid if:
- • Clozapine therapy
Drug interactions:
- • Clozapine
L-Carnitine (Tartrate) safety
Common side effects:
- • Fishy body odor (high doses)
- • GI upset
Avoid if:
- • Hypothyroidism
- • Seizure disorders
Drug interactions:
- • Warfarin
- • Thyroid hormone
Common uses
- • Deep sleep
- • Sleep quality
- • Collagen synthesis
Stacks well with: Magnesium Glycinate, Melatonin
Common uses
- • Fat loss
- • Recovery
- • Endurance
- • Cognitive (acetyl-L-carnitine form)
Stacks well with: Creatine Monohydrate
Related comparisons
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.