Ginseng, while generally safe, may lead to side effects such as insomnia, nervousness, or digestive discomfort, particularly in high doses. Its stimulant properties can interfere with sleep and cause restlessness. Some individuals may experience stomach upset or diarrhea, especially if they have a sensitive stomach. Ginseng can also affect blood pressure, potentially raising it, and may influence hormone levels, impacting conditions like menstrual irregularities. Allergic reactions to ginseng are rare but possible, manifesting as itching, rash, or difficulty breathing.