Research
Micronutrients & recovery
Co-supplementation of whey protein and vitamin D significantly improves lean mass, muscle strength, and physical function in older adults, with particularly strong effects observed in healthy older adults and those not performing resistance exercise.
For older adults, combining whey protein with vitamin D is more effective than either alone for building muscle and improving physical function. This is especially true if you are not doing resistance exercise. Ensure your vitamin D levels are adequate.
ModerateSupportsLOW confidence
By contrast, co-supplementation with vitamin D enhanced LM gains... muscle strength... and physical function... significantly... Muscle strength and physical function improvements after whey protein supplementation plus vitamin D were observed without resistance exercise (RE) and short study duration subgroups.
Why this rating
Meta-analysis of RCTs, but GRADE ratings were low to very low due to heterogeneity.
Source
Whey Protein Supplementation with or without Vitamin D on Sarcopenia-Related Measures: A Systematic Review and Meta-Analysis
Nasrin Nasimi et al. · Advances in Nutrition · 2023
DOI 10.1016/j.advnut.2023.05.011
Meta-analysis · 30 studiesCited 70×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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