Glycine is a naturally occurring amino acid increasingly studied for its role in healthy aging. Preclinical and human research suggests that glycine supports cellular resilience by contributing to mitochondrial-related processes, helping regulate inflammatory signaling, and supporting the body’s endogenous antioxidant systems. Glycine plays a central role in protein metabolism and cellular housekeeping, helping limit the accumulation of damaged proteins that can contribute to age-related cellular dysfunction. It also serves as a key precursor for glutathione, one of the body’s most important intracellular antioxidants, linking glycine availability to redox balance and cellular stress resistance.

In human studies, glycine supplementation has been shown to promote more restful sleep and may support muscle recovery, while mechanistic research suggests it may help reduce the formation of advanced glycation end products (AGEs). Across multiple model organisms, glycine supplementation has been associated with lifespan extension and improvements in healthspan under specific experimental conditions, supporting continued interest in glycine as a candidate nutrient in longevity-focused research.

This Article Covers:

• What Is Glycine? 
• What Are the Benefits of Glycine? 
• How Does Glycine impact longevity? 
• Why Is Glycine included in NOVOS Core?

Key Takeaways

• As a naturally occurring amino acid, glycine supports multiple longevity-related processes
• Extends lifespan in various organisms, according to scientific studies
• Supports mitochondrial function and cellular energy metabolism.
• Helps support protein homeostasis, a key factor in aging.
• Has been shown to reduce oxidative stress and may help modulate chronic low-grade inflammation, particularly in aging contexts.
• Helps reduce the formation of advanced glycation end products (AGEs), which contribute to tissue stiffening and aging.
• Has been shown to improve sleep quality in human studies and may support muscle recovery.
• Serves as a building block for glutathione, a critical antioxidant that protects cells from damage.
  

What Are The Benefits of Glycine? 

Improves Sleep 

Enhanced sleep quality is one of the many benefits of glycine. With better sleep comes:

 In short-term studies, taking about 3 g of glycine at bedtime (equivalent to two NOVOS Core sachets) improved sleep in adults with chronic poor sleep and in healthy office workers with partial sleep restriction (R; R; R).

Bedtime glycine helped people fall asleep faster, sleep more efficiently, and feel more satisfied with their sleep (R; R). Sleep measurements suggested improvements in sleep architecture, including more efficient progression into restorative sleep stages. (R). The next day, participants felt less tired and sleepy, and more alert, lively, and clear-headed (R; R; R).

Objective tests in short-term trials also showed faster reaction times and modest improvements in cognitive performance the following day. Together, these short-term trials suggest that glycine at two-sachet–equivalent doses can enhance sleep initiation and architecture while improving next-day alertness, fatigue, and cognitive performance in adults facing everyday sleep stress.

Enhances Skin Health 

Glycine is central to skin structure because it is the most abundant amino acid in collagen, which itself accounts for about one-third of the body’s protein and is essential for the strength and integrity of connective tissues such as skin, bone, cartilage, and blood vessels (R)

In the collagen triple helix, every third residue is glycine, a pattern that is critical for tight packing and proper fibril formation, underscoring how dependent collagen architecture is on adequate glycine availability during synthesis (R). By supporting collagen structure and stability, dietary glycine may help support the firmness and resilience of the dermal matrix, which are key determinants of skin appearance and mechanical strength.

Glycine may also help protect skin and other tissues from glycation-related damage. Experimental work, primarily in diabetic animal models, suggests that glycine can exert antioxidant and antiglycation effects, suppressing advanced glycation end product (AGE)–receptor (RAGE) signaling and reducing the formation of AGE-modified proteins (R). AGEs arise when sugars react non-enzymatically with proteins, lipids, or nucleic acids, leading to irreversible adducts and crosslinks that accumulate with age.

In collagen-rich tissues, these AGE crosslinks increase fibril stiffness and impair normal mechanical behavior, contributing to the age-related stiffening of the extracellular matrix seen in cartilage, skin, and other connective tissues. (R; R ;R) In the skin, this progressive crosslinking of collagen and other structural proteins is thought to play an important role in loss of elasticity, wrinkling, and visible aging, while similar processes in blood vessel walls promote vascular stiffening over time.

Speeds Recovery 

Glycine plays an important role in cellular recovery because it is one of the three amino acids needed to make glutathione, a major intracellular antioxidant and repair molecule. By supplying more substrate for glutathione synthesis, glycine can help increase glutathione levels and reduce oxidative stress in older adults in some clinical studies (R).

Through its effects on antioxidant defenses and collagen-rich tissues, glycine may also support muscle recovery and joint health, especially when the body is under metabolic or mechanical stress (R). While more human research is needed to define its effects on performance outcomes, its role in glutathione production and tissue repair makes glycine a logical component of recovery-focused longevity strategies. Some athletes use glycine to improve muscle function, joint health, and recovery time (R).

Boosts Metabolic Health 

Research suggests that glycine can support metabolic health in several ways. A recent review concluded that endogenous glycine synthesis is often insufficient to meet metabolic demands and that plasma glycine levels are lower in people with metabolic syndrome than in healthy controls (R) Low circulating glycine is consistently associated with insulin resistance and a higher risk of type 2 diabetes, and improving glycine availability has shown potential benefits for certain glucose and lipid metabolism markers in some studies (R)​.

In clinical studies where older adults and people with type 2 diabetes received supplements providing glycine together with cysteine, glutathione synthesis increased, oxidative stress markers fell, and insulin sensitivity improved (R; R).

By helping to restore glutathione levels and reduce oxidative stress, glycine supports healthier mitochondrial and metabolic function, particularly in individuals with metabolic disturbances. Experimental work also shows that glycine is tightly linked to methionine and one-carbon metabolism, pathways that overlap with the mechanisms by which dietary methionine restriction promotes longevity and metabolic health in animal models (R).

Together, these findings suggest that maintaining adequate glycine status may be an important part of preserving metabolic flexibility and cardiometabolic health with age.

Improves Cognitive Health 

Glycine helps regulate brain signaling by acting as an inhibitory neurotransmitter and by modulating NMDA receptors, which supports normal synaptic function and plasticity. (R).

Through these actions, glycine can influence learning, memory, and other aspects of cognitive function, and has shown neuroprotective effects in preclinical models of ischemia and oxidative stress (R; R).

In preclinical models (including D-galactose–induced neurodegeneration), glycine supplementation has been reported to reduce neuroinflammation and improve learning and memory outcomes (R). In humans, glycine has been studied as an adjunct in a few small clinical trials, with mixed results on cognition and related symptoms. Larger, well-controlled studies are needed to clarify whether these effects are consistent and clinically meaningful (R; R).

Mechanisms Behind Glycine’s Longevity Effects

Beyond its immediate benefits, glycine may support healthy aging by influencing core cellular pathways involved in energy metabolism and stress resilience.

How Does Glycine Consumption Improve Mitochondrial Health? 

Mitochondria are the cell’s energy-producing structures, and mitochondrial dysfunction is a hallmark of aging. Glycine contributes to mitochondrial and metabolic function mainly by:

• Supporting glutathione production, which helps manage oxidative stress
• Supporting one-carbon and amino acid metabolism, pathways linked to cellular maintenance
• Helping maintain efficient energy metabolism under certain conditions

Together, these mechanisms may support cellular resilience and healthy aging, though the strength of evidence varies by outcome and study type.

What Is The Role of Glycine in Longevity?

Several studies suggest glycine can extend lifespan, with effects that depend on species and experimental context.

In Caenorhabditis elegans, glycine supplementation has been reported to increase lifespan by ~10–20% across studies, including work showing longevity benefits linked to methionine-cycle/one-carbon metabolism under specific conditions (R; R).

In mammals, evidence also exists from mice: dietary glycine supplementation has been associated with a ~6% lifespan extension in Mus musculus in a large mouse study, with benefits reported in both sexes (R).

In human cell culture, fibroblasts from very old donors have shown age-related declines in mitochondrial respiration alongside changes in glycine-related metabolism. In one in-vitro experiment, adding glycine to fibroblasts from a 97-year-old donor for several days improved mitochondrial respiration toward a more youthful pattern. Because this was a cell-culture study, it doesn’t demonstrate the same effect in living humans, but it supports a direct, cell-level link between glycine availability and mitochondrial function during aging (R).

Taken together, current evidence suggests that glycine may promote longevity by improving mitochondrial function, supporting one-carbon and methionine metabolism, and reducing oxidative and inflammatory stress, thereby intersecting with several recognized hallmarks of aging

NOVOS CORE & Glycine Supplementation

With NOVOS CORE, you don’t need a separate glycine supplement, as glycine is one of the 12 ingredients in NOVOS Core.

1 sachet of NOVOS Core contains 2000 mg of glycine.