Casein Protein

●●●Strong Evidence

The slow-digesting complement to whey. Forms a gel in the stomach, releasing amino acids over 5–7 hours — ideal before sleep.

Effective Dose

20–40g / serving

per clinical evidence

Evidence Level

Strong

Protein & Amino Acids

Mechanism

Slow-release amino acid delivery, anti-catabolic

primary action

Best For

Overnight recovery

Appetite control, Anti-catabolism

This profile is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications.

What Is Casein Protein?

Casein constitutes ~80% of milk protein and is distinguished by its slow digestion kinetics. It forms a gel in the acid environment of the stomach, providing a sustained drip of amino acids into the bloodstream over 5–7 hours. This makes it anti-catabolic during long periods without food, particularly overnight.

How It Works: The Science

Casein's slow digestion is due to micellar structures that coagulate at low pH, forming a protein gel that resists proteolytic enzymes. Compared to whey, casein produces a lower but more sustained leucine peak — less MPS stimulation acutely, but greater inhibition of muscle protein breakdown over the same time window.

Primary Mechanism

Slow-release amino acid delivery, anti-catabolic

Evidence-Based Benefits

Reduces overnight muscle protein breakdown

strong

Res et al. (2012) — 40g casein pre-sleep increased overnight MPS and net protein balance

Supports lean mass when added to training programme

strong

Cribb et al. (2006) — greater lean mass gains vs carbohydrate in resistance-trained men

Increases satiety and reduces hunger

moderate

Hall et al. (2003) — greater satiety response vs whey at equal protein dose

Dosage Guide

Effective Dose

20–40g / serving

20–40g before bed. Can also be used as a between-meal high-protein snack where slow digestion is advantageous. Micellar casein is the gold standard form; calcium caseinate is slightly faster-digesting.

Safety Profile & Side Effects

Same safety profile as whey protein. Not suitable for milk protein allergy. Lactose content is very low in most commercial casein products.

Who Should (and Shouldn't) Take It

Best for

Overnight recoveryAppetite controlAnti-catabolism

Who it's for

Athletes wanting to optimise overnight recovery and reduce muscle protein breakdown during sleep. Useful for those in caloric deficit. Complement to whey post-workout.

Frequently Asked Questions

What is the recommended dose of Casein Protein?

Is Casein Protein safe?

Same safety profile as whey protein. Not suitable for milk protein allergy. Lactose content is very low in most commercial casein products.

How does Casein Protein work?

Who should take Casein Protein?

Athletes wanting to optimise overnight recovery and reduce muscle protein breakdown during sleep. Useful for those in caloric deficit. Complement to whey post-workout.

Related Ingredients

Whey Protein Isolate EAAs (Essential Amino Acids)L-Glutamine

Medical Disclaimer

Ingredient profiles are for informational purposes only and do not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications. Full disclaimer →