What are the ingredients in Optimal Liposomal Vitamin C Plus sourced from?

Ingredients in Optimal Liposomal Vitamin C Plus are derived as follows:

• Vitamin C is from non-GMO corn glucose, originating from European fields.
• Quercetin dihydrate is from Sophora japonica L. (Japanese Pagoda).
• Rose hip is from Rose rugosa.
• Hesperidin is from orange.
• Phospholipid glycerin proprietary complex is from non-GMO sunflower oil and palm oil.