Quercetin
Quercetin is the most common flavonoid in the human diet, the yellow pigment behind onion skins and apple peels. Here's how naturopaths use it, the traditional herbs that are rich in it, and what the research shows.
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Omega-3 Fish Oil
Fish oil carries EPA and DHA, the long-chain omega-3 fats found in oily fish. Here's how folk medicine and naturopaths have used it, from cod liver oil for "aches and pains" to heart and brain support, and what the big trials found.
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Apple Cider Vinegar
People have used vinegar as a kitchen remedy for thousands of years, from Hippocrates' wound care to the honey-and-vinegar tonics of Persian medicine. Here's what tradition says, what the small modern studies found, and how to take it without hurting your throat.
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Soursop (Graviola)
A tropical fruit tree whose leaves have been brewed as a folk tea across the Caribbean, Latin America and Africa for generations. Here's what tradition says, what the research has (and hasn't) shown, and the safety points every user should know first.
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Rhodiola
A hardy Arctic and mountain root that Scandinavian, Siberian and Russian folk medicine have long used for endurance, cold winters and recovering strength. Today it's one of the best-known "adaptogens" for everyday stress and tiredness.
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Olive Leaf
The silver-green leaves of the olive tree, one of the oldest cultivated trees on earth, have been brewed into a bitter tea around the Mediterranean for centuries. Here's what tradition and research say about them, and who should be careful.
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Berberine
Berberine is the bright-yellow compound behind some of the oldest bitter remedies in Ayurveda and Chinese medicine, from Indian barberry to Chinese goldthread. Today it is one of the most-studied plant compounds for metabolic health, and one of the most interaction-prone, so it is worth reading the safety section first.
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Cinnamon
One of the oldest spices in the world, cinnamon was traded from Asia to Egypt as far back as 2000 BC. Ayurveda, Chinese medicine and Persian medicine all use it as a warming herb for digestion, circulation and the womb, and modern researchers are studying it for period pain and metabolic health.
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Lion’s Mane Mushroom
Lion's mane is the shaggy white "monkey head" mushroom of Chinese and Japanese tradition, eaten as a delicacy and used for centuries to support the stomach and, more recently, memory and mood. Here's what tradition says, what the early research shows, and who should be careful with it.
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Reishi Mushroom
Reishi is the glossy "mushroom of immortality" of Chinese and Japanese tradition, prized for over 2,000 years as a calming, strengthening tonic. Here's what traditional medicine uses it for, what the research says so far, and who should be careful with it.
