A plant’s use as a spice does not establish that every concentrated drink made from it is safe or therapeutic. Base decisions about bay tea on the product’s intended use.
Choose a product intended for beverages
Do not use unidentified leaves or leaves from ornamental plants. Laurus nobilis is different from some poisonous plants with similar common names. Check the label of a beverage product and follow its own quantity and preparation instructions.
Research does not establish a tea course
Limited diabetes research does not validate a daily tea recipe or replacement for medicine. NCCIH advises against substituting herbal supplements for diabetes treatment. We therefore give no universal cup count, treatment course or blood-sugar-lowering promise.
Do not substitute essential oil for leaves
Essential oil is not the same product as a leaf infusion, and incorrect ingestion can be harmful. Do not independently add it to a drink. Discuss regular use with a clinician, particularly if you take medication.
Source: Poison Control — essential oils