Uses & Effectiveness Overview Logwood is a tree. People use the heartwood of logwood to make medicine. People use logwood for diarrhea and minor bleeding from wounds, but there is no good scientific evidence to support these uses. Logwood is a tree native to the tropical regions of America, and its heartwood produces a deep purple dye. Interestingly, this dye was once used in histology to stain tissues, helping scientists to observe cellular structures in greater detail. Side Effects When taken by mouth: There isn?t enough reliable information to know if logwood is safe or what the side effects might be. When applied to the skin: There isn?t enough reliable information to know if logwood is safe or what the side effects might be. Interactions We currently have no information for LOGWOOD overview. Special Precautionsand Warnings When taken by mouth: There isn?t enough reliable information to know if logwood is safe or what the side effects might be. When applied to the skin: There isn?t enough reliable information to know if logwood is safe or what the side effects might be. Pregnancy and breast-feeding: There isn?t enough reliable information to know if logwood is safe to use when pregnant or breast-feeding. Stay on the safe side and avoid use. Dosing The appropriate dose of logwood depends on several factors such as the user?s age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for logwood. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.