Serotonin or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter. Biochemically derived from tryptophan, serotonin is primarily found in the gastrointestinal (GI) tract, platelets, and in the central nervous system (CNS) of animals including humans. It is popularly thought to be a contributor to feelings of well-being and happiness. (from Wikipedia; chain not included)
Can be used as a pendant on a necklace, keychain, earring, or whatever you find it useful for.
Note: the material "(Polished) Strong & Flexible Plastic“ is not recommended for keychains! It’s great for earrings though!
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