Are overweight have higher levels of vitamin C in their bloodstream than those who aren't as overweight or obese?

Higher body weight is known to negatively impact vitamin C status.

Individuals who are over weight are more likely need even higher vitamin C intake. Research has also found a consistent link between low intake of vitamin C and excess body fat but it’s not clear whether it is a cause and effect relationship. Low blood levels of vitamin C have been linked to higher amounts of belly fat, even in normal-weight individuals. As such, dose-finding studies are required to determine optimal vitamin C intakes for overweight and obese people.

Effect of Vitamin C have on fat: Individuals with adequate vitamin C status oxidize 30% more fat during a moderate exercise bout than individuals with low vitamin C status; thus, vitamin C depleted individuals may be more resistant to fat mass loss.
The most common vitamin deficiencies among people who are overweight are vitamins D, C, and B1. Vitamin D deficiency is by far the most prevalent,
affecting at least 80 percent of people with obesity. Symptoms of low vitamin D include bone pain, muscle weakness, and increased risk of developing cardiovascular diseases and certain cancers. There’s also growing evidence that
suggests vitamin D deficiency increases your likelihood of developing type 2 diabetes, as vitamin D is a key to improving insulin resistance.