The use of natural products has increased significantly, but to date, their preparation is unregulated. Their actions can affect normal and abnormal physiological processes as well as interact with prescription medications. Their presence in the body, alone or in combination with over-the-counter products or prescription medications, may physiologically affect the intended target or cause analytical interference in such a way that the test result is affected. For this reason, it is important to note their use. The natural products listed here are contraindicated or are recommended for use with caution in patients with body system disorders or patients taking medications for these disorders. The requesting health-care provider (HCP) and laboratory should be advised if the patient is regularly using these products so that their potential effects can be taken into consideration when reviewing results.
This list is not all-inclusive. Questions regarding the potential benefits and contraindications of natural products should be referred to the appropriate HCP. As a general recommendation, natural products and nutraceuticals are contraindicated during pregnancy and lactation.