I'm a 45 y.O. Black female & my bones & joints ache quite a bit. Occasionally, I get b vitamin & amino acid shots & I hurt much less. Why is that?

Can't be certain. The uses of vitamin injections to help one feel good has been done for years, but I know of no scientific data yet to confirm doing that. The Amino Acid injections - I know of no data about those either. If you are vitamin deficient that may be an explanation but some woudl explain this as a placebo response.