You know, sailors used to get scurvy because of C deficiency back a couple centuries ago. Vitamin C degrades really easily, but is there any way you can store it long term other than pills or tablets? I’m just wondering if it would have been possible to do this in the past with the technology that was available.
Sauerkraut is apparently a reasonable way to store vitamin C for a long time. I imagine cabbage in its own doesn’t keep too well.
Cabbage does store better than most greens, but no, not as long as a preserve would.