Scurvy is a disease where cells are starved by vitamin c... Vitamin C gets into cells via the GLUT-4 transporter. This transporter moves both glucose and vitamin c. In the context of a zero carb diet there is no glucose competing for the glut-4 transporter, so the natural vitamin c levels in the meat are sufficient.

We knew in napoleonic times that soliders with scurvy could be cured with a horse meat diet (it's in the military medical books!)