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Cp7.5
Casein Protein Research
Likely helps
130 peer-reviewed studies
What the evidence says
Likely helps
Casein Protein appears to help in 4 of 4 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1985–2026 with a typical study size of 32 participants.
Based on 130 studies · 7 meta-analyses · 118 RCTs · 2,691 total participants
Confidence
High confidence
What the studies found
4helped· 126 more without graded effect data
By outcome
Lean body mass & muscle growthReduced muscle breakdown, sustained muscle protein synthesis · 4-8 weeks
RecoveryOvernight muscle recovery and repair · Overnight (8 hours)
Mostly mechanism / observational9 studies
Heart & blood pressure
Mostly mechanism / observational7 studies
Endurance & exercise performance
Mostly mechanism / observational6 studies
Cholesterol & lipids
Mostly mechanism / observational5 studies
Digestive health
Mostly mechanism / observational5 studies
Safety profile
Too few graded studies1 study
By the numbers
Pulled from 17 studies with measurable effects
Likely real effects
100%
across studies
People studied
2,691
typical study: 32 people
Strongest designs
125
7 pooled, 118 randomised
Showed benefit
100%
4/4 studies
How long studies ran
Under a week
3
1–3 months
5
Populations Studied
Adults2
Resistance training participants2
General population1
Individuals performing resistance exercise1
Steady research
27 studies in the last 5 years · Latest meta-analysis: 2026
198520052026
1Meta-Analysisn=1,851 · large study2023
In plain English: The findings of this study suggest that supplementation with MP may improve glycemic control in adults by reducing the values of fasting insulin, FBG, and HOMA-IR.
Mohammadi S et al. · Nutrition journal (2023)
The findings of this study suggest that supplementation with MP may improve glycemic control in adults by reducing the values of fasting insulin, FBG, and HOMA-IR.
Additional trials with longer durations are required to confirm these findings.
In plain English: When applied during a prolonged period of resistance-type exercise training, protein supplementation prior to sleep can further augment gains in muscle mass and strength.
Trommelen J, van Loon LJ. · Nutrients (2016)
Protein ingested prior to sleep is effectively digested and absorbed, and thereby stimulates muscle protein synthesis rates during overnight recovery.
Recent studies investigating the impact of pre-sleep protein ingestion suggest that at least 40 g of protein is required to display a robust increase in muscle protein synthesis rates throughout overnight sleep.
When applied during a prolonged period of resistance-type exercise training, protein supplementation prior to sleep can further augment gains in muscle mass and strength.
In plain English: Human-based evidence from clinical trials and epidemiological studies published prior to October 2017 provides moderate certainty for adverse digestive health effects of A1 β-casein compared with A2 β-casein but low or very low certainty for other health effects.
Küllenberg de Gaudry D et al. · Nutrition reviews (2019)
Human-based evidence from clinical trials and epidemiological studies published prior to October 2017 provides moderate certainty for adverse digestive health effects of A1 β-casein compared with A2 β-casein but low or very low certainty for other health effects.
These conclusions may change in the future, given the emergent nature of this topic and the ongoing research in this area.
In plain English: 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, and future research is needed to clarify the relationships observed.
Dela Cruz J et al. · Nutrients (2021)
However, it remains unclear what the effect of this nutritional strategy is on non-muscular parameters such as metabolism and appetite in both healthy and unhealthy populations.
The purpose of this systematic review is to understand the effects of pre-sleep casein protein on energy expenditure, lipolysis, appetite, and food intake in both healthy and overweight or obese individuals.
A systematic review following PRISMA guidelines was conducted in CINAHL, Cochrane, and SPORTDiscus during March 2021, and 11 studies met the inclusion criteria.
In plain English: These results suggest that hemp protein consumption, as well as in combination with bioactive peptides, may have a role in the dietary management of hypertension.
Samsamikor M et al. · The American journal of clinical nutrition (2024)
These results suggest that hemp protein consumption, as well as in combination with bioactive peptides, may have a role in the dietary management of hypertension.