if this is really problematic.

It had been found in a single study that vitamin C and grape-seed polyphenols [and also pycnogenol which I often prescribe] may raise blood pressure for unknown reasons. Pycnogenol can be an important supplement!

Those who have hypertension may prefer to get their vitamin C from fruits [at least in these cases] How “real” the problem is, I can’t tell you

https://pubmed.ncbi.nlm.nih.gov/15662232/