Summary
Muscle health is about more than muscle size. Strength, physical function, mobility, and the ability to stay active are all important parts of healthy muscle. Research on HMB has explored its role in muscle protein metabolism and supporting muscle health, strength, and physical function, particularly as maintaining muscle becomes more important with age.
Key Takeaways
- Muscle mass, strength, and physical function are related but distinct aspects of muscle health.
- Resistance exercise and adequate protein remain foundational for maintaining healthy muscle.
- HMB is a naturally occurring metabolite of leucine that has been studied across muscle health, strength, and physical function.
- Healthy muscle is ultimately about supporting the body’s ability to move and perform over time.
- Muscle health is closely connected with bones, joints, and other tissues that make up the musculoskeletal system.
When people think about muscle health, muscle size is often the first thing that comes to mind.
But healthy muscle is about much more than appearance.
Strength, mobility, and physical function all influence how well the body performs everyday tasks, from climbing stairs and carrying groceries to exercising and staying active later in life.
That is why muscle health is better understood by looking at more than one measure.
Muscle Mass, Strength, and Function Are Different
Although closely connected, muscle mass, strength, and physical function describe different parts of muscle health.
Muscle mass refers to the amount of muscle tissue in the body.
Muscle strength refers to the amount of force that muscle can generate.
Physical function reflects how well the body uses that strength during everyday movement.
A person may therefore experience changes in strength or physical performance even when changes in muscle size are less noticeable.
Looking at all three can provide a more complete picture of how well muscle is functioning over time.
Muscle Health Is Part of a Bigger System
Muscles do not work in isolation. They are part of the musculoskeletal system, which also includes bones, joints, tendons, and connective tissues that work together to support movement, stability, and everyday physical activity.
Healthy muscles help generate the force needed for movement while also supporting joints, balance, posture, and overall physical function. At the same time, regular movement and resistance exercise place beneficial mechanical stress on bones and other supporting tissues.
Because these systems are interconnected, changes in muscle strength or function can influence how efficiently the body moves and performs everyday tasks. Supporting muscle health is therefore an important part of maintaining overall musculoskeletal health and staying active over time.
This broader perspective is especially important as we age, when maintaining strength, mobility, and physical function can become increasingly important for preserving independence and quality of movement.
Where HMB Fits Into Muscle Health
Beta-hydroxy-beta-methylbutyrate, or HMB, is a naturally occurring metabolite of the essential amino acid leucine.
The body produces HMB during normal leucine metabolism, but only a small amount of dietary leucine is converted into HMB.
Supplemental HMB has been studied for decades across areas including muscle protein metabolism, strength, recovery, and physical function.
Research featured in the myHMB® Clinical Research library also explores how HMB may relate to other foundational strategies such as protein intake, Vitamin D, and exercise.
What Recent Research Shows About HMB and Protein
A 2026 randomized, double-blind crossover study examined HMB alongside whey protein in 24 healthy adults between the ages of 65 and 75.
Participants consumed either 40 grams of whey protein alone or 40 grams of whey protein plus 3 grams of calcium HMB.
Both conditions increased muscle protein synthesis after eating. Among the older women in the study, adding HMB further increased the muscle protein synthesis response compared with protein alone.¹
Researchers also observed greater suppression of muscle protein breakdown during part of the post-meal period when HMB was added.¹
The findings provide new insight into the relationship between HMB, dietary protein, and muscle protein turnover in older adults.
HMB, Vitamin D, and Physical Function
Other research has examined HMB in relation to muscle strength and physical function.
A year-long randomized, double-blind study included 117 adults age 60 and older who received either HMB plus Vitamin D or placebo.
Researchers evaluated strength, body composition, and several measures of physical function.
Among participants who were not participating in the resistance-training program, HMB plus Vitamin D increased lean mass at six months and improved knee-extension strength at three months compared with placebo.²
A combined measure of physical function, including handgrip strength and mobility-based testing, also improved at several points during the study.²
These findings highlight why muscle health should be evaluated through more than muscle size alone.
Looking at Everyday Physical Performance
Another HMB study examined healthy women over age 65 participating in a mild fitness program.
Women receiving a protein drink containing calcium HMB showed improvements in several secondary outcomes, including leg strength, handgrip endurance, muscle density, and walking performance.³
While not every outcome differed between groups, the study adds to the broader research examining HMB and functional measures of muscle health.
Supporting Healthy Muscle Takes a Broader Approach
No single ingredient or activity determines muscle health.
Instead, several habits work together:
- Stay active. Regular movement helps keep muscles engaged.
- Include resistance exercise. Strength-based activity supports muscle strength and function.
- Consume adequate protein. Protein provides amino acids needed for muscle protein synthesis.
- Prioritize recovery. Nutrition and rest help support the body’s response to physical activity.
- Consider targeted nutrition. HMB has been studied as part of broader strategies designed to support muscle health.
Healthy Muscle Is About What Your Body Can Do
Muscle health should not be measured only by what can be seen in the mirror.
Strength, mobility, and physical function all contribute to the ability to stay active and perform everyday activities over time.
Research into HMB continues to expand across areas including muscle protein metabolism, strength, and physical performance.
That broader body of science reinforces an important idea:
Supporting muscle is ultimately about supporting the body’s ability to keep moving and performing over time.
myHMB® is backed by decades of research investigating HMB across muscle health, recovery, strength, and physical performance.
References
- Smith K, Abdullah H, Rudrappa S, et al. The Effect of β-Hydroxy-β-Methyl Butyrate (HMB) upon Acute Fed-State Muscle Protein Turnover in Older Men and Women: A Randomized Double-Blind Controlled Crossover Clinical Trial. Nutrients. 2026;18(9):1449. https://www.mdpi.com/2072-6643/18/9/1449
- Rathmacher JA, Pitchford LM, Khoo P, et al. Long-term Effects of Calcium β-Hydroxy-β-Methylbutyrate and Vitamin D3 Supplementation on Muscular Function in Older Adults With and Without Resistance Training: A Randomized, Double-blind, Controlled Study. J Gerontol A Biol Sci Med Sci. 2020;75(11):2089–2097. https://pubmed.ncbi.nlm.nih.gov/32857128/
- Berton L, Bano G, Carraro S, et al. Effect of Oral Beta-Hydroxy-Beta-Methylbutyrate (HMB) Supplementation on Physical Performance in Healthy Old Women Over 65 Years: An Open Label Randomized Controlled Trial. PLoS One. 2015;10(11):e0141757. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0141757
