BUFFALO, NY — November 11, 2025 — A new #research paper was #published in Volume 17, Issue 10 of Aging-US on October 1, 2025, titled “L-β-aminoisobutyric acid (L-BAIBA) in combination with voluntary wheel running exercise enhances musculoskeletal properties in middle-age male mice.”
In this study led by first author Julian A. Vallejo and corresponding author Michael J. Wacker from the University of Missouri, Kansas City, researchers investigated how L-β-aminoisobutyric acid (L-BAIBA), a natural compound released during exercise, works together with regular physical activity to improve muscle and bone health in middle-aged male mice. The findings may support new strategies to maintain musculoskeletal health in aging populations, especially those at risk for mobility loss or osteoporosis.
Muscle and bone strength naturally decline with age, increasing the risk of falls, fractures, and reduced quality of life. While exercise remains the most effective way to counteract this deterioration, it is often difficult for older individuals to maintain sufficient activity levels to see results. L-BAIBA, a molecule naturally produced during physical activity, is known to promote energy metabolism and support muscle and bone cells. This study explored its potential to work in synergy with endurance exercise to maximize health benefits in aging bodies.
Researchers studied 12-month-old male mice that were split into different groups. Some remained sedentary, while others exercised freely on running wheels. Half of each group received daily L-BAIBA supplementation. After three months, the mice that received both the supplement and exercise showed greater improvements than those receiving either one alone. The soleus, a slow-twitch muscle essential for endurance and balance, grew larger and stronger only in the combined treatment group. These muscles also shifted to a more fatigue-resistant fiber type and had a larger number of oxidative fibers.
“To investigate this hypothesis, we subjected 12-month-old (as a model of middle-age) male C57BL6 mice to voluntary wheel running (VWR) with L-BAIBA (100mg/kg/day) (VWR+L-BAIBA), VWR alone, L-BAIBA alone, or none (CTRL) for three months.”
The study also showed significant improvements in bone health. Mice that received both exercise and L-BAIBA developed thicker and denser trabecular bone, along with reduced fat levels in the bone marrow, indicators of stronger, healthier bones. These changes were not observed in the groups that only exercised or only received L-BAIBA. Although the compound caused minor changes in heart electrical activity, it did not affect heart size or overall function, suggesting it is safe in this setting.
These findings suggest that L-BAIBA may enhance the benefits of physical activity by supporting muscle strength and bone structure, particularly in slow-twitch muscle fibers. This combination could serve as a therapeutic strategy to help older adults, including those unable to engage in regular exercise, maintain musculoskeletal health.
As the aging population grows, there is a growing need for solutions that support muscle and bone health without requiring strenuous activity. This research highlights the potential of natural, exercise-related molecules like L-BAIBA to help maintain mobility and strength throughout aging.
DOI - https://doi.org/10.18632/aging.206325
Corresponding author - Michael J. Wacker — wackerm@umkc.edu
Abstract video - https://www.youtube.com/watch?v=A-zfrLUikfQ
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BUFFALO, NY — November 11, 2025 — A new #research paper was #published in Volume 17, Issue 10 of Aging-US on October 1, 2025, titled “L-β-aminoisobutyric acid (L-BAIBA) in combination with voluntary wheel running exercise enhances musculoskeletal properties in middle-age male mice.”
In this study led by first author Julian A. Vallejo and corresponding author Michael J. Wacker from the University of Missouri, Kansas City, researchers investigated how L-β-aminoisobutyric acid (L-BAIBA), a natural compound released during exercise, works together with regular physical activity to improve muscle and bone health in middle-aged male mice. The findings may support new strategies to maintain musculoskeletal health in aging populations, especially those at risk for mobility loss or osteoporosis.
Muscle and bone strength naturally decline with age, increasing the risk of falls, fractures, and reduced quality of life. While exercise remains the most effective way to counteract this deterioration, it is often difficult for older individuals to maintain sufficient activity levels to see results. L-BAIBA, a molecule naturally produced during physical activity, is known to promote energy metabolism and support muscle and bone cells. This study explored its potential to work in synergy with endurance exercise to maximize health benefits in aging bodies.
Researchers studied 12-month-old male mice that were split into different groups. Some remained sedentary, while others exercised freely on running wheels. Half of each group received daily L-BAIBA supplementation. After three months, the mice that received both the supplement and exercise showed greater improvements than those receiving either one alone. The soleus, a slow-twitch muscle essential for endurance and balance, grew larger and stronger only in the combined treatment group. These muscles also shifted to a more fatigue-resistant fiber type and had a larger number of oxidative fibers.
“To investigate this hypothesis, we subjected 12-month-old (as a model of middle-age) male C57BL6 mice to voluntary wheel running (VWR) with L-BAIBA (100mg/kg/day) (VWR+L-BAIBA), VWR alone, L-BAIBA alone, or none (CTRL) for three months.”
The study also showed significant improvements in bone health. Mice that received both exercise and L-BAIBA developed thicker and denser trabecular bone, along with reduced fat levels in the bone marrow, indicators of stronger, healthier bones. These changes were not observed in the groups that only exercised or only received L-BAIBA. Although the compound caused minor changes in heart electrical activity, it did not affect heart size or overall function, suggesting it is safe in this setting.
These findings suggest that L-BAIBA may enhance the benefits of physical activity by supporting muscle strength and bone structure, particularly in slow-twitch muscle fibers. This combination could serve as a therapeutic strategy to help older adults, including those unable to engage in regular exercise, maintain musculoskeletal health.
As the aging population grows, there is a growing need for solutions that support muscle and bone health without requiring strenuous activity. This research highlights the potential of natural, exercise-related molecules like L-BAIBA to help maintain mobility and strength throughout aging.
DOI - https://doi.org/10.18632/aging.206325
Corresponding author - Michael J. Wacker — wackerm@umkc.edu
Abstract video - https://www.youtube.com/watch?v=A-zfrLUikfQ
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Rapamycin Shows Limited Evidence for Longevity Benefits in Healthy Adults
Aging-US
3 minutes 55 seconds
1 month ago
Rapamycin Shows Limited Evidence for Longevity Benefits in Healthy Adults
BUFFALO, NY — September 24, 2025 — A new #research paper was #published in Volume 17, Issue 8 of Aging-US on August 7, 2025, titled, “What is the clinical evidence to support off-label rapamycin therapy in healthy adults?”
In this study, led by Jacob M. Hands from The George Washington University School of Medicine and Health Sciences, researchers analyzed current research to determine whether low-dose rapamycin can extend healthspan or delay aging in healthy adults. While studies in animals have shown promising results, this review found no clear clinical evidence that the same benefits apply to humans. The findings point to the urgent need for larger, better-designed human trials before recommending rapamycin for off-label use to prevent aging.
Rapamycin, originally developed as a drug to suppress the immune system, has gained interest as a possible anti-aging therapy. It works by blocking a key cellular pathway called mTOR, which plays a role in growth and metabolism. In animal studies, blocking this pathway has extended lifespan. However, the translation of these results to humans remains uncertain. The current study examined clinical trials and observational studies involving healthy adults who took low doses of rapamycin or similar drugs.
“This paper has reviewed trials of low-dose mTOR inhibition therapy in human subjects.”
Some trials showed encouraging signs. For example, older adults treated with low-dose mTOR inhibitors showed stronger immune responses and fewer respiratory infections. Other studies suggested possible improvements in subjective well-being and physical performance, such as walking speed and strength. Still, none of the trials directly showed that rapamycin extends life or clearly slows the aging process.
One small study using a biological aging model (PhenoAge) suggested that users might have reduced their biological age by nearly four years, but the estimate was based on average values, not individual patient data.
There are also concerns about side effects. While short-term use seems safe, some studies reported increases in blood lipids and markers of inflammation. Research on muscle health produced contradictory findings—some studies suggest rapamycin might reduce the body’s ability to build muscle. The impact on mental health is also unclear, with a few participants reporting increased anxiety during treatment.
The researchers emphasize that rapamycin’s role in human aging is still uncertain. Off-label use is growing among longevity clinics and individuals seeking anti-aging solutions, but there is no standard dose, and long-term safety is unknown. The authors advise that off-label use should be approached with caution, including careful monitoring and full disclosure about the limited evidence.
Overall, while animal studies have demonstrated promising effects, human trials have not yet shown that rapamycin can safely or effectively slow aging or extend lifespan. More rigorous and well-controlled studies are necessary before the drug can be considered a reliable option for healthy adults interested in longevity interventions.
DOI - https://doi.org/10.18632/aging.206300
Corresponding author - Jacob M. Hands - jacobhands@gwu.edu
Abstract video - https://www.youtube.com/watch?v=cdWUenvB_mY
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Aging-US
BUFFALO, NY — November 11, 2025 — A new #research paper was #published in Volume 17, Issue 10 of Aging-US on October 1, 2025, titled “L-β-aminoisobutyric acid (L-BAIBA) in combination with voluntary wheel running exercise enhances musculoskeletal properties in middle-age male mice.”
In this study led by first author Julian A. Vallejo and corresponding author Michael J. Wacker from the University of Missouri, Kansas City, researchers investigated how L-β-aminoisobutyric acid (L-BAIBA), a natural compound released during exercise, works together with regular physical activity to improve muscle and bone health in middle-aged male mice. The findings may support new strategies to maintain musculoskeletal health in aging populations, especially those at risk for mobility loss or osteoporosis.
Muscle and bone strength naturally decline with age, increasing the risk of falls, fractures, and reduced quality of life. While exercise remains the most effective way to counteract this deterioration, it is often difficult for older individuals to maintain sufficient activity levels to see results. L-BAIBA, a molecule naturally produced during physical activity, is known to promote energy metabolism and support muscle and bone cells. This study explored its potential to work in synergy with endurance exercise to maximize health benefits in aging bodies.
Researchers studied 12-month-old male mice that were split into different groups. Some remained sedentary, while others exercised freely on running wheels. Half of each group received daily L-BAIBA supplementation. After three months, the mice that received both the supplement and exercise showed greater improvements than those receiving either one alone. The soleus, a slow-twitch muscle essential for endurance and balance, grew larger and stronger only in the combined treatment group. These muscles also shifted to a more fatigue-resistant fiber type and had a larger number of oxidative fibers.
“To investigate this hypothesis, we subjected 12-month-old (as a model of middle-age) male C57BL6 mice to voluntary wheel running (VWR) with L-BAIBA (100mg/kg/day) (VWR+L-BAIBA), VWR alone, L-BAIBA alone, or none (CTRL) for three months.”
The study also showed significant improvements in bone health. Mice that received both exercise and L-BAIBA developed thicker and denser trabecular bone, along with reduced fat levels in the bone marrow, indicators of stronger, healthier bones. These changes were not observed in the groups that only exercised or only received L-BAIBA. Although the compound caused minor changes in heart electrical activity, it did not affect heart size or overall function, suggesting it is safe in this setting.
These findings suggest that L-BAIBA may enhance the benefits of physical activity by supporting muscle strength and bone structure, particularly in slow-twitch muscle fibers. This combination could serve as a therapeutic strategy to help older adults, including those unable to engage in regular exercise, maintain musculoskeletal health.
As the aging population grows, there is a growing need for solutions that support muscle and bone health without requiring strenuous activity. This research highlights the potential of natural, exercise-related molecules like L-BAIBA to help maintain mobility and strength throughout aging.
DOI - https://doi.org/10.18632/aging.206325
Corresponding author - Michael J. Wacker — wackerm@umkc.edu
Abstract video - https://www.youtube.com/watch?v=A-zfrLUikfQ
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