Nicotine is usually discussed as an addictive drug. But in 1959, researchers noticed something unexpected: people who smoked appeared less likely to develop Parkinson’s

Microplastics have been detected in human brain tissue, and in 2025 one study produced a number that spread around the world: roughly a spoonful of

BPC-157 is now used as a recovery peptide for tendon injuries, muscle strains, and stubborn joint problems. Some people report remarkable results, while others

There is an element sitting in your brain right now, and nobody has established how much you are supposed to have. It may shape how

The companion to the episode. Every study behind the lithium-for-your-brain claim, tested one at a time, with the water-concentration data and the one measurement that changes the question.

Creatine is one of the most-studied supplements in the world, taken by millions of people who have been told for years it is about

There are tests now that claim to measure how old you really are. Not the number on your birth certificate, but your biological age, the

Your “biological age” test is making a prediction, not taking a measurement. Why that changes what the number means. A test tells you your body

For decades, the reassuring story about tattoos was that the ink stays put: a permanent mark, sealed in the skin, chemically done with your body.

Two studies asked the same question about tattoos and melanoma and got opposite answers. Here's what that contradiction actually reveals, and what the evidence can and can't tell you yet.

For most of a decade, vitamin D came with a warning: take it on its own, and the calcium it raises ends up in your

The claim that vitamin D needs K2 or it hardens your arteries, measured against the trials that actually scanned people's arteries.