All About Herbs: How Supplements are Made | Vitacost Blog
https://www.vitacost.com/blog/all-about-herbs-how-supplements-are-made/
Herbs are grown for their leaves, flowers, fruit, seeds, bark, or roots, depending on where the herb’s active compounds are found. St. John’s Wort , for example, is grown for its flowers and leaves, which you may find listed as “aerial parts” (those growing above rather than below the soil), though some herbalists prefer the flowers.
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