Feb 22, 2026Vitamin E: Tocopherol vs Tocotrienol Forms, Antioxidant Evidence, and Supplementation RisksVitamin E encompasses eight molecules: four tocopherols and four tocotrienols. Synthetic dl-alpha-tocopherol dominates the supplement market but has underperformed in trials. Tocotrienols — especially delta and gamma forms — show more promising cardiovascular and neuroprotective signals.
Feb 18, 2026Vitamin C: Immune Function, Collagen Synthesis, Antioxidant Evidence, and Megadose ClaimsVitamin C is essential for collagen hydroxylation, neutrophil function, and regeneration of other antioxidants including vitamin E. Deficiency is common in older adults and smokers. Supplementation shortens cold duration modestly; megadose claims for cancer and longevity are not supported by RCT evidence.
Feb 17, 2026Selenium: Thyroid Function, Antioxidant Enzymes, Cancer Prevention Evidence, and Toxicity RiskSelenium is an essential trace mineral and key component of glutathione peroxidase and selenoprotein P. It has the strongest evidence base in thyroid autoimmunity (Hashimoto's) and antioxidant enzyme function. The SELECT trial found no cancer prevention benefit from selenium in replete populations — and excess is toxic.
Feb 11, 2026Pterostilbene vs Resveratrol: Bioavailability, Sirtuin Activation, and Evidence ComparisonPterostilbene is a methylated resveratrol analog with substantially better oral bioavailability. It activates SIRT1 and AMPK, lowers blood pressure in some trials, but has fewer published human studies than resveratrol. The trade-off between bioavailability and evidence depth is real.
Jan 30, 2026Melatonin Beyond Sleep: Antioxidant Role, Circadian Health, and Mitochondrial Protection in AgingMelatonin production declines with age, affecting not just sleep but also circadian gene regulation, mitochondrial antioxidant defense, and neuroinflammation. Evidence is strongest for sleep; antioxidant and longevity roles are plausible but less clinically established.
Jan 26, 2026PQQ (Pyrroloquinoline Quinone): Mitochondrial Biogenesis, NGF Upregulation, and Evidence QualityPQQ stimulates mitochondrial biogenesis via PGC-1alpha and upregulates nerve growth factor (NGF). Human trial evidence is limited but suggests improvements in cognitive function and sleep quality. Often stacked with CoQ10.
Jan 20, 2026Astaxanthin: Marine Carotenoid, Oxidative Stress, and Exercise Recovery EvidenceAstaxanthin is a potent marine carotenoid with evidence for reducing exercise-induced oxidative stress and muscle damage markers. Its lipophilic structure and singlet oxygen quenching capacity make it notably effective compared to other antioxidants.
Jan 11, 2026Green Tea EGCG: Metabolic Effects, Longevity Pathways, and BioavailabilityEGCG (epigallocatechin gallate) is green tea's primary bioactive catechin. Evidence supports modest effects on body composition, insulin sensitivity, and cardiovascular markers, though bioavailability from supplements varies significantly.