During the use of Japanese vitamin C (Cinal), attention should be paid to specific food taboos and medication risks for special populations. Reasonable avoidance can ensure the safety and effectiveness of medication. The following are detailed instructions on specific prohibited foods and medication for special populations:

1. Forbidden foods

(1) High oxalate foods: Spinach, beets, nuts, etc. may increase the risk of kidney stones. It is recommended to consume them every 2 hours.

(2) Alkaline drinks, such as soda water, may neutralize the acidity of vitamin C and reduce absorption, so they should be avoided from being taken together.

(3) Alcoholic beverages: may accelerate vitamin C metabolism and affect the duration of drug efficacy.

2. Medication for special populations

(1) Pregnant women: The daily dose should not exceed 1000mg, as excessive doses may affect the fetal redox balance.

(2) Breastfeeding period: High dose intake may alter the composition of breast milk, and it is recommended to control it within 200mg/day.

(3) Kidney disease patients: If the glomerular filtration rate is less than 30mL/min, the dose should be halved and urinary protein should be monitored.

(4) Children: Calculate the dosage based on body weight (10-15mg/kg) to avoid long-term excessive effects on bone development.

(5) Elderly people: Over 65 years old should pay attention to urine acidification and regularly check kidney function.

3. Drug interactions

(1) Antacids: Aluminum/magnesium containing preparations can complex with vitamin C and should be taken every 2 hours.

(2) Estrogen: Vitamin C may increase the blood concentration of estrogen, and the dosage of contraceptive pills needs to be adjusted.