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αs1-Casein Hydrolysate (Lactium / casein decapeptide)
A milk-derived bioactive peptide — a tryptic hydrolysate of bovine αs1-casein standardized to the decapeptide α-casozepine (Lactium) — marketed for stress, anxiety, and sleep. Honest appraisal: the mechanism is real and food-derived (α-casozepine binds the benzodiazepine site of the GABA-A receptor in vitro), and a handful of small human RCTs show modest reductions in stress symptoms and cortisol plus some sleep-diary improvements. But several trials are industry-linked, two well-designed sleep RCTs were null on their primary endpoint, and effects are small. Well-tolerated; this is an ordinary dietary supplement, not a drug.
What the evidence says
Most Casein Hydrolysate studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 1978–2025 with a typical study size of 100 participants.
Based on 54 studies · 1 meta-analysis · 49 RCTs · 311 total participants
Confidence
Moderate confidenceBy outcome
A plausible food-derived GABA-A mechanism and several small RCTs show modest stress/cortisol and some sleep benefits, but effects are small, trials are partly industry-linked, and two combination sleep RCTs were null — keeping it emerging.
58 rigorous studies
57 randomized trials · 1 meta-analyses · 0 systematic reviews
Our evidence rating for Casein Hydrolysate is accountable to this entire body of rigorous research indexed in PubMed — not a hand-picked subset.
PubMed · as of Jul 2026
3 trials ongoing or recruiting · 18 completed on ClinicalTrials.gov
1 of the completed trials have posted results
Registered trials show research momentum for Casein Hydrolysate, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
Under EU law (Reg. 1924/2006), EFSA reviews whether a specific health claim for Casein Hydrolysate meets the evidence standard. These are independent regulatory decisions on claims — not studies, and never counted toward the evidence score above.
Not authorised by EFSA
“Lactium-peptide compoundRegulates stress hormone secretion. Stabilises vital functions during stress”
“Hydrolysat de protéines de lait: milk protein hydrolysate concentrated with 1,7 % of alphaS1 decapeptide (=Lactium) Can help with better resisting the stress”
“Not authorised” means the specific claim wording did not meet the EU’s evidence standard — often a matter of dossier or phrasing, not proof of no effect. EFSA judges marketing claims and is kept separate from our study-based evidence score.
Source: EU Register of nutrition and health claims (European Commission / EFSA) · register snapshot Feb 2013
Casein hydrolysate in the stress/sleep context refers specifically to a tryptic enzymatic digest of bovine αs1-casein (milk protein) standardized to contain α-casozepine — a 10-amino-acid peptide (residues 91-100 of αs1-casein) sold under the brand Lactium.
Unlike whey or casein protein powders taken for muscle, this is a low-dose (~150 mg/day) bioactive-peptide ingredient taken for its calming properties.
The mechanism is genuinely food-derived: in the original 2001 characterization, α-casozepine showed benzodiazepine-like activity and affinity for the GABA-A receptor benzodiazepine site, and animal work shows oral αs1-casein hydrolysate increases sleep duration and modulates GABA-A receptor subunit expression.
Human evidence is modest. The most-cited positive trials are a 30-day double-blind crossover in 63 stressed women (150 mg/day reduced several stress-symptom domains) and an acute study in healthy volunteers showing blunted blood-pressure and cortisol responses to laboratory stress.
Sleep results are mixed: one crossover RCT in poor sleepers found improved sleep-diary measures and actigraphic sleep efficiency, but two more recent placebo-controlled trials of Lactium-containing combination products were NULL on their primary sleep endpoints (with only secondary sleep-diary signals).
A notable confound is that several of these trials were funded by or co-authored with the manufacturer (INGREDIA / Ingredia SA).
Taken together the evidence is best described as emerging-to-low-moderate: a plausible, food-derived anxiolytic mechanism with several small, partly industry-linked RCTs showing modest stress/cortisol/sleep effects.
It is well-tolerated and, being a milk-protein fraction, is a normal dietary supplement — the main caution is milk allergy.
The decapeptide α-casozepine shows benzodiazepine-like activity and affinity for the benzodiazepine binding site of the GABA-A receptor in vitro — the proposed basis for its calming, anxiolytic-like effect (a food-derived 'natural benzodiazepine-like' action, far weaker than a drug).
In rodents, oral αs1-casein hydrolysate increases sleep duration, shifts EEG toward slow-wave/theta activity, and elevates GABA-A receptor β1-subunit expression in the hypothalamus — supporting a GABAergic, sleep-promoting action.
Human trials report blunted cortisol and blood-pressure responses to acute stress and lower serum cortisol over weeks, consistent with dampening of HPA-axis stress reactivity.
How Casein Hydrolysate works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Avoid — it is derived from bovine milk casein.
As a normal food-protein component it is likely safe, but dedicated pregnancy trials are lacking — use under guidance if desired.
Use caution due to the theoretical additive calming effect.
Theoretical additive sedation given the GABA-A benzodiazepine-site mechanism, though the effect is far weaker than a drug; use caution if combining with prescription sedatives.
Possible mild additive calming/sedative effect; no clinically significant interaction documented.
Tip: Take in the evening; reduce dose
Tip: Take with food
Casein Hydrolysate has an evidence score of 4/10 — emerging evidence based on 52 indexed studies. A milk-derived bioactive peptide — a tryptic hydrolysate of bovine αs1-casein standardized to the decapeptide α-casozepine (Lactium) — marketed for stress, anxiety, and sleep. Honest appraisal: the mechanism is real and food-derived (α-casozepine binds the benzodiazepine site of the GABA-A receptor in vitro), and a handful of small human RCTs show modest reductions in stress symptoms and cortisol plus some sleep-diary improvements. But several trials are industry-linked, two well-designed sleep RCTs were null on their primary endpoint, and effects are small. Well-tolerated; this is an ordinary dietary supplement, not a drug. Representative study: PMID 28218661.
The commonly studied dose of Casein Hydrolysate is 150 mg/day of standardized αs1-casein hydrolysate (Lactium), taken once daily; acute studies have used ~200 mg. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Casein Hydrolysate is in the evening. It can be taken on an empty stomach. For sleep/relaxation, most trials dose once daily; an evening or before-bed dose is common when the goal is sleep, while daytime dosing has been used for stress reactivity.
Casein Hydrolysate is generally well-tolerated and considered safe for most healthy adults at recommended doses. Reported side effects are uncommon and include mild drowsiness, mild GI discomfort. Use caution if any of these apply to you: Milk / dairy protein allergy (it is a bovine milk-protein fraction).
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 55 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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