What Are the Benefits of Taking HMB and Vitamin D3 Together?

On the surface, bodybuilders and sedentary and elderly individuals might not seem like they have a ton in common, but one thing is true about them both: muscle health is a big part of their life and well-being. After all, muscle strength isn't just about looking "ripped"; it's critical to remaining mobile.

For this reason, you'll spot HMB and vitamin D3 supplements in both fitness stacks and healthy aging supplement regimens. HMB has been studied for its support of muscle mass, strength, growth and function—and especially when combined with the sunshine vitamin, it has impressive benefits for aging individuals.

Let's talk about both nutrients, how they complement one another, and their benefits both for athletes and those in their golden years.

Why are HMB and vitamin D3 often taken together?

HMB and vitamin D3 are great options for people looking to support:

• Muscle health
• Strength
• Bone health
• Physical performance
• Recovery
• Mobility

In fact, research shows that taking these supplements combined long-term, is especially beneficial for physical ability and muscle strength in older adults, even if they don't engage in resistance training.

Even more good news: If an older individual doesn't exercise due to physical limitations, HMB and vitamin D3 can help with that, too!

Research has also found that while HMB may increase muscle mass regardless of vitamin D status, an increase in strength may be more likely to occur when vitamin D levels are sufficient. This further supports the combination of these two supplements.

How does HMB support muscle health?

Your body naturally produces HMB (β‐hydroxy‐β‐methyl butyrate) while it's metabolizing leucine, a branched-chain amino acid that's important for protein synthesis and muscle strength.

Athletes have been flocking to this compound in recent years because research suggests it not only supports the synthesis of muscle proteins, but HMB may slow the breakdown of these proteins, thus encouraging the stability of your muscles and, therefore, the quality of that tissue.

And that's just the beginning. HMB also impacts your muscles' glycogen storage—aka the body's process of converting sugar into carbohydrates.

Because of this, HMB can support oxidative function, which increases your aerobic capacity. Better yet, HMB is considered a powerful ally to muscle mass and strength because it does so without causing significant changes in fat mass or overall body weight.

While HMB is a smart supplement for anyone who prioritizes their fitness, it may be particularly beneficial for individuals over the age of 65 for supporting muscle growth and function, including those who are sedentary.

One study of 70-year-old adults participating in a strength training program and supplementing daily with HMB even noted body composition changes similar to those in younger adults.

As Michael A. Smith, MD, Life Extension's Director of Education, sums it up: "Growing muscle is one of the most important things we can do for our health. HMB helps make it easier!"

What role does vitamin D3 play in muscle and bone health?

What purpose does the sunshine vitamin D serve when it comes to your muscle mass and bones? For starters, it:

• Promotes healthy muscle function and metabolism
• Impacts energy consumption in a way that may influence muscle strength
• Helps support a healthy inflammatory response

Similar to HMB, research has also found that vitamin D may particularly help the body maintain lean mass and play a role in muscle recovery after exercise.

As an added bonus, vitamin D promotes bone health by helping the body to absorb calcium that comes from food. Additionally, it supports bone strength in older adults.

Pro tip: There are different types of vitamin D. Vitamin D3 is often used in supplement formulas because it's more bioavailable compared to vitamin D2.

Who may benefit most from HMB and vitamin D3 supplementation?

While everyone benefits from getting the nutrients they need, there are certain individuals who might find a combination of HMB and vitamin D3 particularly beneficial:

• Older adults, especially those 65 years of age and above
• Individuals who are sedentary, whether due to limitations or lifestyle choices
• Individuals with low vitamin D status

Pro tip: Low vitamin D intake remains prevalent on a global scale. If you're not sure if your levels are healthy, talk to your doctor about getting lab work to better determine if your vitamin D levels are adequate.

And remember, while this combination can be especially beneficial for older adults, for muscle and bone support at any age, look to the real one-two punch of dietary supplements: HMB and vitamin D3.

Can HMB and vitamin D3 help without exercise?

Yes, even adults who aren't physically active may benefit from supplementing with HMB and vitamin D3. However, it's vital to find a way to move your body a little bit every day.

You'll see the best results by taking a holistic approach that combines fitness, nutrition, and sleep. Speak with your healthcare provider about how you can safely start an exercise program, along with what the best dosage of HMB and vitamin D3 may be for you.

Is this combination mainly for older adults?

Anyone can supplement with HMB and vitamin D3. However, because this duo supports muscle preservation, older adults may stand to benefit more.

Is it safe to take HMB and vitamin D3 with other fitness supplements?

Yes! If you want to be cautious, speak with your healthcare provider first. You might also consider introducing one new supplement at a time, once you're already taking HMB and vitamin D3.

References

• Agoncillo M, et al. "The Role of Vitamin D in Skeletal Muscle Repair and Regeneration in Animal Models and Humans: A Systematic Review." Nutrients. October 2023. https://pubmed.ncbi.nlm.nih.gov/37892452/
• Bideshki MV, et al. "Ergogenic Benefits of β-Hydroxy-β-Methyl Butyrate (HMB) Supplementation on Body Composition and Muscle Strength: An Umbrella Review of Meta-Analyses." J Cachexia Sarcopenia Muscle. February 2025. https://pmc.ncbi.nlm.nih.gov/articles/PMC11724150/
• Cangussu LM, et al. "Effect of vitamin D supplementation alone on muscle function in postmenopausal women: a randomized, double-blind, placebo-controlled clinical trial." Osteoporos Int. October 2015. https://pubmed.ncbi.nlm.nih.gov/25956283/
• Cui A, et al. "Global and regional prevalence of vitamin D deficiency in population-based studies from 2000 to 2022: A pooled analysis of 7.9 million participants." Frontiers in Nutrition. March 2023. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2023.1070808/full
• Fuller JC Jr, et al. "Vitamin D status affects strength gains in older adults supplemented with a combination of β-hydroxy-β-methylbutyrate, arginine, and lysine: a cohort study." JPEN J Parenter Enteral Nutr. November 2011. https://pubmed.ncbi.nlm.nih.gov/21807930/
• Rathmacher JA, 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." The Journals of Gerontology. November 2020. https://academic.oup.com/biomedgerontology/article/75/11/2089/5898559
• Vukovich MD, et al. "Body composition in 70-year-old adults responds to dietary beta-hydroxy-beta-methylbutyrate similarly to that of young adults." J Nutr. July 2001. https://pubmed.ncbi.nlm.nih.gov/11435528/
• "Calcium and Vitamin D: Important for Bone Health." National Institute of Arthritis and Musculoskeletal and Skin Diseases. https://www.niams.nih.gov/health-topics/calcium-and-vitamin-d-important-bone-health