Herbal Supplements by Swanson. Details:As any chef will tell you, thyme can be found throughout a wide range of recipes, but thyme has also been in used as far back as the time of the Romans for its health benefits. A member of the mint family, thyme is a flowering evergreen shrub. Thyme has been used traditionally for promoting respiratory health, a robust immune system, occasional heartburn, and occasional upset stomach. So next time you sprinkle some thyme on your favorite dish, remember that it's more than just a flavor enhancer. Each serving (1 capsule) contains 500 mg of thyme leaves (Thymus vulgaris).