With these definitions:
Natural vitamin C is vitamin C derived from a plant.
Synthetic vitamin C is not derived from a plant (nor animal) but made in a
Is your vitamin C synthetic?
As far as I know there are very few and and highly expensive products derived exclusively from plants, (why not eat a few oranges every day?) but these products apparently ignore the problem that vitamin C is unstable, the most unstable vitamin. It is unlikely much vitamin C would be preserved in the manufacturing (squeezing) process. Even Standard Process used "synthetic" ascorbic acid in their vitamin C products - I have checked.
Some in the natural community claim that ascorbic acid is not vitamin C,but while they may be well meaning, or they may be trying to sell products, this claim is nonsense and ignores 80 years of science.
Other products claim to be "natural" because they add a "citrus complex" which has nothing to do with vitamin C.
If you have a particular product in mind, we'd be happy to investigate it.
I have written an article about so-called "natural" vitamin C here:
We also have a forum on this topic at vitamincfoundation.org/forum
Our vitamin C is the "best" you can buy - the purest.