Hello my friend I am D.Arianisa Thanks for your question on HCM Many people eat ginger candies or fresh ginger in the foods they consume, but you may have questions about how ginger may darken the color of your urine. Commonly available varieties of ginger are not likely to change the hue, but some types of ginger--wild ginger--might have an effect on urine color. Do not guess at the cause of urinary changes While ginger normally available in your grocery store has no bearing on urine color, wild ginger may darken your urine. Wild ginger is not traditionally eaten, but you may find it used in Chinese medicines. Wild ginger contains aristolochic acid, a substance that negatively influences your kidneys. One symptom of aristolochic acid-triggered disease is blood in your urine, which can make it look significantly darker in color. Tell him to see his physician, as darkened urine may indicate a medical problem and specially if your friend see blood on urine Hope he gets better soon Best regards