Kat Fu

Melatonin is often framed as the body’s sleep hormone, but its reach extends far beyond circadian signaling. Acting on mitochondria, redox systems, and hormone pathways, melatonin has been studied as a potential longevity molecule. Yet evidence shows that at high doses it can impair glucose metabolism, blunt synaptic plasticity, and disrupt reproductive signaling. This article examines melatonin’s dual role—mitochondrial protection and antioxidant defense on one side, metabolic and hormonal risks on the other—and what current safety data reveal about its use in aging.

Most people reach for melatonin to fall asleep—but that’s not how it works. This article explains why melatonin often fails to fix sleep schedules for healthy adults or keep you asleep, and what to do instead if your goal is long-term brain health, toxin clearance, and cognitive resilience.

Even if you’re getting “enough” sleep, your brain might still be shrinking.

MRI studies show that disrupted, fragmented, or REM-poor sleep is linked to measurable brain atrophy—especially in regions that govern focus, planning, and emotional regulation. And this starts earlier than most expect—often in your 30s and 40s.

Testosterone and sperm aren’t just fertility metrics—they’re early biomarkers of how your body is aging. This article breaks down the overlooked role of vitamin B12 in male hormone health, sperm motility, and DNA integrity. Backed by human studies, mechanistic data, and actionable testing tips, it makes the case for using B12 status as an early signal for biological decline.

A standard vitamin B12 blood test often misses the earliest signs of decline. If you’re optimizing for cognitive function, energy, and longevity, you need deeper markers. This guide breaks down the 3 tests that reveal what total B12 can’t.

B12 brain fog might seem harmless—but new research suggests it could be an early warning sign of cognitive decline. Here’s what to watch for before it’s too late.

Vitamin D hair loss is often reversible. Here are 5 proven steps to restore density, fix deficiencies, and support your scalp from the inside out.