Vitamin D level of 3 is considered severe deficiency and it can definitely cause back pain, muscle soreness and fatigue. In people with fatty
liver and obesity, Vitamin D metabolism also gets affected, so correction needs a properly planned nutrition + supplement protocol, not just tablets.
Along with Vitamin D, factors like magnesium,
calcium balance, gut absorption and body fat reduction also play an important role.
I usually guide patients with a step-wise diet and supplementation plan specific for fatty liver and vitamin D correction. If you want, you can connect with me and I can help you plan it properly.