Under normal circumstances, most people taking vitamin B6 will not experience side effects. However, a certain percentage of people will have different body types or use vitamin B6 improperly, which will cause side effects in the human body. First, if the human body has a special constitution and is more sensitive to the drug, a common side effect of taking vitamin B6 is allergy, which is usually accompanied by adverse symptoms such as itchy skin, swollen skin, nausea and dizziness. Secondly, long-term use of vitamin B6 may also cause peripheral neuritis. Taking large amounts of vitamin B6 can also lead to platelet aggregation in the body, resulting in adverse side effects such as weakness, dizziness, nausea, and blurred vision. Finally, some people who take vitamin B6 for a long time may also become dependent on it. Vitamin B6 is mainly used for vitamin B6 deficiency. Once vitamin B6 is reduced, it may cause symptoms such as dizziness and muscle weakness.