VIT C gives you the whole day a sufficient dosage.
Vitamin C is probably the best known among the vitamins and very important for a good immune system. Especially when your daily physical or mental effort to deliver.
VIT C helps your intake well spread over the day and the food is technically a sensible addition to plenty of vegetables and fruits.
Do not take more than 1 tablet VIT C per 120 minutes.
When you are mentally and / or physically exert yourself requires or are recovering from an illness or injury, a high dose of vitamin C often still advisable.
Are you trying to quit smoking, you have to deal with air pollution or training along roads or eat enough fruits and green? Then you can have multiple tablets throughout the day.