How to Use the Pre-Sleep Casein Protein Calculator
Casein makes up about 80% of milk protein and digests slowly, which makes it a popular choice for a pre-sleep protein source. Since you go several hours without eating while asleep, having a slow-releasing amino acid source can help protect against muscle breakdown during that window. Enter your body weight to get a recommended pre-sleep casein dose in grams.
A common guideline is roughly 0.4g of casein per kg of body weight before bed, and this calculator uses that same standard. To account for individual variation, results are capped between 20g and 50g so the number stays in a realistic range. Whey protein absorbs quickly, so it may not sustain amino acid supply through most of the night — casein or a casein-heavy blend tends to work better for this purpose.
Casein is generally considered safe within typical serving amounts, but people with a milk protein allergy or lactose intolerance may experience digestive discomfort. If you have kidney issues or take other protein supplements, talk to a doctor or registered dietitian before settling on your nightly dose.
Frequently Asked Questions
Casein digests and absorbs more slowly than whey, releasing amino acids gradually over several hours of sleep. This may help reduce overnight muscle breakdown and support recovery.
Whey absorbs quickly, so amino acid supply may run out for much of the night. If your goal is overnight support, casein or a casein-heavy blend is generally a better fit.
It's generally considered safe within typical serving ranges, but if you have lactose intolerance or kidney issues, consult a doctor or dietitian before adding it to your routine.