Casein Protein vs Magnesium L-Threonate
Protein vs Sleep · evidence-backed comparison
- • Casein Protein has the stronger evidence base (strong (multiple rcts / meta-analyses)).
- • Casein Protein has the broader effect profile across the 9 effect categories.
- • Casein Protein is cheaper per serving ($0.95 vs $1.10).
- • Magnesium L-Threonate has higher bioavailability (better absorption).
Side-by-side traits
| Trait | Casein Protein | Magnesium L-Threonate |
|---|---|---|
Category | Protein | Sleep |
Active compound | Casein micelles | Magnesium L-threonate |
Form available | Powder | Capsule, Powder |
Source | animal | synthetic |
Typical dose | 25–40 g per serving | 1.5–2 g (≈144 mg elemental Mg) |
Dose range | 25–40 g | 1500–2000 mg |
Loading protocol | — | — |
Best taken with | water or milk | evening |
Best time of day | evening | evening |
Bioavailability How efficiently the body absorbs and utilizes the compound. | High (4/5) | Very High (5/5) |
Onset time | Slow: 4–7 hour drip-feed of amino acids | Cumulative: 4–12 weeks |
Half-life | ~5 hours | — |
Evidence level Quality and quantity of human research. | Strong (multiple RCTs / meta-analyses) | Limited (small studies) |
Overall effect Subjective effect magnitude. | Moderate (3/5) | Moderate (3/5) |
Muscle / strength | High (4/5) | Very Low (1/5) |
Physical energy | Low (2/5) | Very Low (1/5) |
Focus / cognition | Very Low (1/5) | High (4/5) |
Mood / stress | Low (2/5) | Moderate (3/5) |
Sleep quality | Moderate (3/5) | High (4/5) |
Immunity | Moderate (3/5) | Very Low (1/5) |
Recovery Post-exercise recovery support. | High (4/5) | Very Low (1/5) |
Longevity / healthspan | Moderate (3/5) | Moderate (3/5) |
Safety rating 5 = exceptionally well-tolerated; 1 = significant risk profile. | Very High (5/5) | Very High (5/5) |
Price per serving Approximate USD per typical daily dose. | $0.95 | $1.10 |
Vegan friendly | No | Yes |
Gluten free | Yes | Yes |
3rd-party tested | Yes | Yes |
About Casein Protein
Slow-digesting milk protein that drip-feeds amino acids for hours. Best taken before bed to support overnight muscle protein synthesis.
About Magnesium L-Threonate
Only magnesium form proven to cross the blood-brain barrier in animals. Marketed for cognitive aging and sleep, but premium-priced.
Vetted brands, third-party testing, ships worldwide.
Vetted brands, third-party testing, ships worldwide.
Casein Protein safety
Common side effects:
- • Bloating
- • Gas (lactose)
Avoid if:
- • Milk allergy
- • Casein sensitivity
Drug interactions:
- • Levodopa
Magnesium L-Threonate safety
Common side effects:
- • Drowsiness
- • Headache (rare)
Avoid if:
- • Severe kidney disease
Drug interactions:
- • Bisphosphonates
Common uses
- • Overnight recovery
- • Satiety
- • Anti-catabolic
Stacks well with: Zinc
Common uses
- • Cognitive aging
- • Deep sleep
- • Memory
Stacks well with: Zinc, Vitamin D3
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.