Thymol is available in form of pills, powders or liquid extract. Select according to the use. Also check for its expiration date on the packaging.
(1) https://www.livestrong.com/article/163688-uses-of-thymol/
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NutriBuddy™ 
Description
Thymol is a naturally occuring, colorless crystalline substance obtained from thyme oil or other volatile oils. It is either in the form of large, colorless crystals or white crystalline powder.