Vitamin B and vitamin C are water-soluble vitamins, and the best time to take them is after meals, which is less burdensome to the human gastrointestinal tract, but specific problems should be analyzed, and patients are advised to take them according to medical advice. Vitamin B and vitamin C are essential vitamins for the human body and are very important for maintaining normal physiological functions. Vitamin B is known as a coenzyme provider of energy metabolism and helps to resist stress and fatigue. If taken too late, it can lead to insomnia; if taken in the morning, the body cannot fully absorb it, so it is best taken after lunch. Vitamin C, on the other hand, should be taken in the morning or evening to help the body absorb it with better results, but vitamin C is an acidic vitamin and is generally not recommended to be taken on an empty stomach. Vitamin B and vitamin C can be obtained from food, it is not necessary to take health supplements, and it is not advisable to supplement them blindly. It is recommended to eat normally in daily life, eat more fresh vegetables and fruits, and maintain a good lifestyle.