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$19.30
per keychain
From Tryptophan To Serotonin (Chemistry Humour) Key Ring
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Style
Aluminum Circle
+$1.75
+$1.75
+$41.95
+$41.95
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About This Design
From Tryptophan To Serotonin (Chemistry Humour) Key Ring
No need to be a chemistry major or milk drinker to enjoy wry educational humour with any of these chemical molecule gifts featuring how tryptophan becomes serotonin. Make others do a double-take when you showcase "From Tryptophan To Serotonin - No Wonder Why Drinking Milk Has Such A Calming Effect". Scientific attitude gifts to calm down your chemical side!
Customer Reviews
4.6 out of 5 stars rating5.4K Total Reviews
5,414 Reviews
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By Ali Y.4 February 2026 • Verified Purchase
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Lovely & cute keychains i love them thank you sooo much ,they also reached to me soo fast 😍.
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By Jessica K.2 March 2023 • Verified Purchase
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These keychains were perfect for our 5th grade traveling volleyball team. I just added a tassle, and they were the perfect gift! .
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By E.11 June 2025 • Verified Purchase
I am very happy with this product. I like the design and the keychain is lightweight. .
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Product ID: 146843808343815802
Posted on 10/01/2010, 12:12 PM
Rating: G
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