Most people assume that Oranges or citrus fruit contain the highest amount of Vit C...Whilst they are a very good source, they are in fact not on top of the list. The top 10 list is as follows , assuming you consume 100g:
1-Hot red or green Chilli
5-Dark Leafy Greens
The recommendation for a healthy adult is to consume 2 fruits a day on average, so you should aim to increase your Vitamin C intake through Vegetables.
A glass of fresh Orange juice will contain 3-4 oranges at least and that is just too much sugar for your body to handle in one shot. I would recommend you increase the consumption of bell peppers, leafy greans, parsley and broccoli in your daily diet. In addition to boosting your Vit C levels, they offer a myriad of amazing nutrients and overall health benefits.