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Sale Price $8.25.
Original Price $13.75 Comp. value
per keychain
You save 40%
From Tryptophan To Serotonin (Chemistry Humor) Keychain
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Style
Aluminum Circle
+$3.55
+$3.55
+$17.55
+$17.55
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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
5,402 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 linda f.June 18, 2025 • Verified Purchase
Premium Round, Small (1.44")
So cute and this is perfect!!!
5 out of 5 stars rating
By Christina J.March 11, 2024 • Verified Purchase
Premium Round, Large (2.125")
These are a durable metal and the colors are vibrant. One of the clasp came broken but received a new one quickly. Customer service was responsive and quick to resolve the issue. They are bigger than I thought but still work for my wedding. I am satisfied with the print quality and surprised at how vibrant the colors are.
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Other Info
Product ID: 146843808343815802
Created on: 1/10/2010, 12:12 PM
Rating: G
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