What are the side effects and risks of vitamin C and niacinamide?

Generally, vitamin C may cause side effects and health risks such as diarrhea, allergic reactions, enamel damage, scurvy, and stone formation. Nicotinamide may lead to adverse effects including bodily discomfort, skin allergies, gastrointestinal disturbances, blood system abnormalities, and liver or kidney damage. If any discomfort occurs, prompt medical attention is recommended. Detailed analysis is as follows:

I. Side Effects and Hazards of Vitamin C

1. Diarrhea
Taking large amounts or using vitamin C for prolonged periods may irritate the intestinal mucosa, leading to gastrointestinal dysfunction. Sensitive individuals are particularly prone to developing diarrhea.

2. Allergic Reactions
Individuals with an allergy-prone constitution may experience allergic reactions when consuming excessive vitamin C, manifesting as symptoms like itching and redness.

3. Enamel Damage
Vitamin C is inherently acidic. High concentrations of vitamin C can have a corrosive effect on tooth enamel, potentially causing surface wear or thinning of the enamel.

4. Scurvy
Vitamin C is a water-soluble vitamin. Long-term excessive intake may result in its accumulation in the body. Once large amounts of vitamin C are metabolized and depleted, it may paradoxically trigger scurvy.

5. Stone Formation
Excessive use of vitamin C may increase the risk of forming urinary stones, including urate, cystine, and oxalate stones.

II. Side Effects and Hazards of Nicotinamide

1. General Adverse Reactions
A small number of patients may experience adverse reactions such as nausea, dizziness, loss of appetite, and upper abdominal discomfort. In rare cases, severe reactions such as elevated blood pressure and pupil constriction may occur.

2. Skin Allergy
Some patients may develop allergic reactions after using nicotinamide, such as skin itching and swelling. In severe cases, difficulty breathing may also occur.

3. Gastrointestinal Discomfort
Nicotinamide is a vitamin-like medication. Long-term and high-dose use may irritate the gastrointestinal tract, leading to symptoms such as nausea, vomiting, and diarrhea.

4. Blood System Abnormalities
The use of nicotinamide may lead to blood system disorders, such as reduced white blood cell count or decreased platelet count.

5. Liver and Kidney Function Damage
Nicotinamide is primarily metabolized through the liver and kidneys. Prolonged use may increase the burden on these organs, impairing their function and potentially causing liver or kidney damage.

Maintaining healthy lifestyle habits is advisable. Avoid spicy and irritating foods, as they may hinder recovery.