Consume equal parts spinach and orange/lemon juice for best absorption of iron. It’s okay to drink more orange or lemon juice than that, but it might be more costly.
The presence of vitamin C is most important when eating foods that also contain inhibitors of iron absorption. Orange juice and spinach are a great combination.
The promotion of iron ...
It sounds like you have an iron deficiency [bleeding gums is a common symptom], not a vitamin C deficiency.
You probably feel better when eating a lot of fruit because, to many people's surprise, many fruits have some iron. In addition, vitamin C found in fruit helps you absorb iron found in other plant based food. Here is some things you can do
When you ...
Meat and animal protein is not a source of Vitamin C nor is sun exposure a source of Vitamin C.
Fruits and Vegetables are the primary source of Vitamin C and neither a Vegetarian or Vegan diet are a cause of Vitamin C deficiency.
From your question, perhaps you are thinking of Vitamin D?
For sources of vitamin C, you can have a look here. You might also ...