The libraryStrength
Casein
It curdles into a clot that keeps feeding you long after whey has run out.
Also called Micellar Casein, Caseinate, Calcium Caseinate, Sodium Caseinate, Casein Protein
Who it's forAny man who lifts and sleeps a full night on an empty stomach.
The item
Three squares: proven in human trials. Two: a strong signal. One: early human data. Striped: the trials disagree.
Why it works
Stomach acid makes casein micelles clot into a soft gel that empties slowly. It releases amino acids over hours rather than in a spike. That is the whole reason casein is called slow and whey fast. It is a complete protein. So it supplies both the leucine signal that switches on muscle protein synthesis and the material to build with. That makes overnight its natural use.
Where it fits
Casein is a move in 5 protocols. Each one opens the plan it sits in.
What people say
Here is what doctors, influencers and men online say about Casein, word for word.
Experts
Clinicians, authorities
“LTP may be effective in BP reduction, especially in Japanese individuals; however sub-group, meta-regression analyses and statistically significant publication biases suggest inconsistencies.”
“A summary of the main findings shows limited to no effects on metabolism or appetite when ingesting 24-48 g of casein 30 min before sleep, but data are limited”
“Therefore, casein protein provides your body with a slow, steady release of amino acids, making it ideal before fasting situations, such as sleep.”
Gurus
Podcasts, channels, influencers
“Personally, I prefer whey. I find casein protein less palatable, and it doesn’t mix as well.”
“In fact, slow digestion may be an asset during other times of the day. However, after exercise, slow proteins might not be best.”
“Casein is one of the most extreme examples of such “slow proteins,” but generally speaking, solid protein sources will be absorbed more slowly than protein powders and shakes”
Regular people
Forums, reviews, comments
“Casein has me farting all night. I bought it because I was told it would make thicker shakes.”
“I really feel casein before bedtime improves my sleep drastically! (I have a bucket of micellar casein powder)”
“That would be an allergic reaction, and highly unlikely. My son had a milk protein allergy as an infant and the solution was a casein based baby formula.”
The studies
Every study behind this page.
- Pre-sleep casein protein ingestion: new paradigm in post-exercise recovery nutritionPubMed, PMID 32698256
- Pre-Sleep Casein Supplementation, Metabolism, and Appetite: A Systematic ReviewPubMed, PMID 34070862
- Casein-derived lactotripeptides reduce systolic and diastolic blood pressure in a meta-analysis of randomised clinical trialsPubMed, PMID 25608938
- Effect of Casein Hydrolysate on Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis of Randomized Controlled TrialsPubMed, PMID 36235859
- Comparative Efficacy of Different Protein Supplements on Muscle Mass, Strength, and Physical Indices of Sarcopenia among Community-Dwelling, Hospitalized or Institutionalized Older Adults Undergoing Resistance Training: A Network Meta-Analysis of Randomized Controlled TrialsPubMed, PMID 38612975
- Effects of Supplementation with Milk Proteins on Body Composition and Anthropometric Parameters: A Systematic Review and Dose-Response Meta-AnalysisPubMed, PMID 41470822
- Registered trial NCT07436260Trial registry
- Registered trial NCT07567443Trial registry
- Registered trial NCT07049731Trial registry
- Registered trial NCT06870097Trial registry
Words on this page
- PMID
- A study's ID number in PubMed, the public index of medical research.
Drink casein before bed. It's the one protein with a job while you sleep.
Emergency: call 911.
I am not a doctor. This is not medical advice. This is self-education. Talk to a physician who has your history before you change anything.