Do the perceived effects of stem cell injections vary depending on the purpose?

I'm looking into stem cell injections, and it seems the purposes are divided into skin, scalp, and vein treatments.

Should I view fatigue improvement and skin elasticity as completely different things?

I'm confused because some people feel results after just one injection, while others say multiple sessions are necessary.

I'm also wondering if they determine the treatment method best suited to my specific concerns during the consultation.

For those who have received stem cell injections, what was your initial goal?