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Sale Price $9.40.
Original Price $11.75 Comp. value
per keychain
You save 20%
From Tryptophan To Serotonin (Chemistry Humor) Keychain
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Style
Aluminum Circle
+$3.00
+$3.00
+$31.10
+$31.10
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From Tryptophan To Serotonin (Chemistry Humor) Keychain
No need to be a chemistry major or milk drinker to enjoy wry educational humor 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
5,388 Reviews
Reviews for similar products
5 out of 5 stars rating
By Ali Y.February 4, 2026 • Verified Purchase
Aluminum Circle, 2"
Lovely & cute keychains i love them thank you sooo much ,they also reached to me soo fast 😍.
5 out of 5 stars rating
By Jessica K.March 2, 2023 • Verified Purchase
Aluminum Circle, 2"
Zazzle Reviewer Program
These keychains were perfect for our 5th grade traveling volleyball team. I just added a tassle, and they were the perfect gift! .
5 out of 5 stars rating
By E.June 11, 2025 • Verified Purchase
I am very happy with this product. I like the design and the keychain is lightweight. .
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Other Info
Product ID: 146843808343815802
Created on: 1/10/2010, 12:12 PM
Rating: G
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