A
vitamin D of 9.5 is clearly deficient, and a
B12 of 171 is on the lower end too, and together these commonly show up as fatigue, body ache or low mood. Levels this low usually need proper correction, not just an over-the-counter pick on your own.
Next Steps
See a physician to get the right strength and course of
vitamin D and
B12 supplementation for your levels, and add B12-rich foods like eggs, dairy and meat along with some daily sunlight.
Health Tips
Don't self-start a long-term high-dose supplement without medical guidance, since the right strength depends on how low your levels are.