Nobody knows what 0.3 g does to the body because we've spent 20 years on the ISS doing zero-g "science" even after the most important question was answered: Q:

Nobody knows what 0.3 g does to the body because we've spent 20 years on the ISS doing zero-g "science" even after the most important question was answered: Q: What does zero-g do to the human body? A: It's really really unhealthy.