Vitamin -C is better taken thru out the day . You could eat an ,orange,,guava,papaya,grapefruit ,lemon,tomatoes,cantalope,strawberries,re or green peppers,brussel sprouts,broccoli. Studies have shown that once a certain amount of nutrient has produced a balance any excess can accumulate in the body and remain unmetabolized. Vitamin C may be the exception ,as it's use is benificial at higher than normal amounts because of it's effects as an antioxidant. So, I'd say take a Vit -C thru out the day. 250mg to 500mg. Every 4 to 6 hours. Or Suck an Orange .