Nutrition

Glucosamine sulfate is one of the most popular supplements taken for joint support. More than 40 million Americans take this compound daily for stiff joints and pain associated with osteoarthritis. Eight percent of seniors report taking glucosamine, making people ages 60 and up the biggest market for this supplement. What does the research show about its effectiveness and potential side effects? In this article, we discuss these questions, and reveal a 2026 study that links accelerated dementia in glucosamine supplement users who already showed signs of dementia.

Glucosamine Studies

Glucosamine sulfate is primarily studied for its potential to relieve osteoarthritis (OA) symptoms, especially in the knees. Research also looks at its role as a potential cartilage-preserving agent, particularly in relation to osteoarthritis management.
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Vitamin C is best known for immune support, but its role in healthy aging is broader than that. Ascorbic acid, the chemical name for Vitamin C, helps the body make collagen, supports blood vessel integrity, assists wound healing, improves the absorption of iron from plant foods, and acts as an antioxidant. These functions matter throughout the body, including in the brain and eyes.

A recent large study of older adults adds another reason to pay attention to vitamin C status. Researchers found that lower plasma vitamin C levels were associated with lower gray matter volume and weaker connectivity in a major brain network involved in memory, attention, and self-reflection. The study does not prove that vitamin C prevents brain shrinkage or cognitive decline. However, it does suggest that healthy vitamin C levels may be one marker of better brain aging. ¹
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Could NMN help the body age more successfully? NMN, or nicotinamide mononucleotide, is a naturally occurring compound that helps the body produce NAD+, a vital substance found in every living cell. NAD+ plays an important role in cellular energy, DNA repair, mitochondrial function, inflammation control, and other processes that help the body stay resilient over time. However, NAD+ does not remain steady throughout life. One observational study in humans found that NAD+ levels may drop by about 50% by age 50.

For older adults, this decline may be important. Lower NAD+ levels have been associated with metabolic dysfunction, inflammation, reduced mitochondrial performance, and other changes tied to aging and chronic disease risk. Since NMN helps the body make NAD+, researchers are studying whether NMN supplementation may help restore some of this lost cellular support. NMN has recently entered the supplement market. Early research suggests that NMN may benefit several areas of aging health, including energy metabolism, insulin function, brain and nerve health, cardiovascular support, muscle function, inflammation balance, and eye health.
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N-Acetyl-Cysteine is an amino acid that has been researched heavily for its antioxidant and anti-inflammatory properties. NAC is primarily a building block for glutathione. Key clinical studies explore its role in respiratory health, vision support, liver function, aging, and anti-inflammatory properties.

As an antioxidant, NAC helps protect healthy cells by neutralizing free radicals before they can cause harm. It supports the body’s supply of cysteine, a key building block of glutathione, one of the body’s most important internal antioxidants. By helping restore glutathione levels, NAC strengthens the cell’s antioxidant defenses and helps clear reactive oxygen species, or ROS. NAC also has anti-inflammatory effects. In the early stages of immune activation, it may help reduce the release of cytokines, which are chemical messengers involved in inflammation. ¹
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Your nervous system runs on communication. Nerves send signals from the brain and spinal cord out to the rest of the body, and back again. Myelin is the protective, fatty coating wrapped around many nerve fibers. Think of it as insulation around wiring: it helps signals travel faster, more clearly, and with less electrical leakage. ¹

Myelin is also part of a bigger support system. In the central nervous system (the brain and spinal cord), specialized cells called oligodendrocytes help build and maintain myelin. These cells do not just wrap nerves; they also support neurons structurally and metabolically, helping the nervous system meet energy demands over time.
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Vitamin B12 is a water-soluble vitamin your body needs for DNA synthesis, red blood cell formation, and healthy nervous system function. When vitamin B12 levels are low, people can develop anemia and experience fatigue and weakness. Therefore, maintaining adequate B12 levels is important for day-to-day energy and overall health. However, B12 can be low even in people who eat Vitamin B12-rich meat and dairy products. Vitamin B12 cannot be produced in the body, so it must be obtained from food or supplements.¹

Newer research suggests vitamin B12 (cobalamin) status may influence more than nerve function alone. Findings highlighted in 2026 point to a relationship between vitamin B12 and skeletal muscle mitochondrial function (the cell’s energy-producing machinery), which may contribute to metabolic resilience and aspects of healthy aging.² In practical terms, maintaining adequate B12 may help support muscle function and strength over time, which can matter for mobility and injury risk as we age.
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Glutathione is a master antioxidant, meaning it can help neutralize a wide range of free radicals in the body. This article explains the roles glutathione plays in the body, focusing on why it matters for healthy aging. We review how glutathione supports the eyes’ natural defenses against oxidative stress. And, we discuss research linking lower glutathione levels with common vision concerns such as cataracts, glaucoma, and macular degeneration, along with a brief look at emerging research on glutathione’s role in cellular protein handling. It also covers practical ways to support glutathione through diet and supplementation.
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A large body of scientific research backs up the claim that astaxanthin is great for your body. As a potent antioxidant, astaxanthin scavenges free radicals that cause cellular damage. This benefits many parts of the body, including your skin, eyes, and brain. What is astaxanthin? Where does it come from? And what does the latest research say about its benefits?

Astaxanthin is a Pigment that Makes Seafood Pink

Astaxanthin is a marine xanthophyll carotenoid primarily produced by microalgae like Haematococcus pluvialis. Dietary astaxanthin can be obtained through seafood, including salmon, trout, shrimp, and krill.
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Vitamin D is often called the “bone vitamin,” but that’s only part of the story. Vitamin D3 (cholecalciferol) also influences systems your eyes rely on every day—especially as we get older: inflammation control, immune regulation, oxidative stress protection, and even how the body manages blood vessel growth.

And here’s the real-world issue: most people don’t get enough vitamin D consistently. Food sources are limited, sunlight is seasonal and complex (plus many of us avoid it for skin health), and modern indoor life takes care of the rest.
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Coronary artery disease stands as the leading form of heart disease in the United States, impacting more than 20 million people. Among atherosclerosis’s most serious risks are heart attacks and strokes, both of which can have life-altering consequences. Fortunately, there are powerful steps you can take to protect your heart health. Building a balanced diet, staying active, and using carefully chosen supplements all play an important role in preventing and managing atherosclerosis. In this article, we will discuss how atherosclerosis happens, its effects on the body, and nutrients that support heart health. We also review basic lifestyle choices, such as exercise and remaining smoke-free, that can add years to your life.
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