Curcumin is the active compound in turmeric. It’s what gives the spice its yellow color. Turmeric has been used in traditional medicine for centuries, but the science on curcumin has only gotten serious in the last 15 years.
Here’s the catch that most supplement companies won’t tell you. Plain curcumin has terrible bioavailability. Your body can’t absorb it. If you’re taking a basic turmeric capsule, almost none of it reaches your bloodstream.
Melatonin is a hormone your brain makes every night. Your pineal gland starts producing it when it gets dark and stops when light hits your eyes. It tells your body when to sleep. Not how deeply to sleep. That distinction matters.
You can also take it as a supplement. It’s the most popular sleep aid in the United States. About 3.1 million Americans use it regularly. But melatonin isn’t a sleeping pill. It’s a timing signal. It shifts your internal clock, and that’s what makes it useful for things like jet lag and delayed sleep.
Zinc is an essential mineral your body needs for over 300 enzyme reactions. It plays a big role in immune function, wound healing, and cell division. Your body doesn’t store it, so you need a steady supply from food or supplements.
You’ll see zinc marketed for everything from fighting colds to boosting testosterone to clearing acne. Some of these claims have solid research behind them. Others don’t.
Ashwagandha is an adaptogenic herb used in Ayurvedic medicine for thousands of years. Its scientific name is Withania somnifera. It’s one of the most studied herbal supplements available today.
You’ll see it marketed for everything from anxiety to testosterone to muscle growth. Some of those claims hold up. Others don’t.
We analyzed 12 meta-analyses and systematic reviews covering 47 individual studies. Here’s what the data actually shows.
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