This chemical is a clear, colorless liquid. It is a primary ingredient in citrus oils and can be found naturally in citrus fruits. As such, it emits a strong, pleasant odor and has a similar taste. According to the FDA, d-limonene is generally regarded as safe (GRAS) for human consumption. One primary application of d-limonene is as a flavoring agent. It can be found in a variety of food items, including sodas, juices, and ice cream. This substance has also been found to neutralize gastric problems, including acid reflux and heartburn. It can also help dissolve cholesterol in the body, so it is used as a treatment for that as well. In concentrated doses, d-limonene can be slightly toxic and may irritate the skin or eyes. It produces sharp vapors that could hurt the lungs, so a breathing mask should be worn. It may also evaporate in the air, so it should be stored in an airtight container.