How long does the effect of intravenous stem cell injections last?

I've recently become interested in anti-aging and am looking into stem cell intravenous injections.

I'm curious about how long the effects of stem cell intravenous injections last.

Opinions are divided: some say it lasts a long time after just one injection, while others say you need to get them consistently.

I'm confused because of this split.

Hospitals say the duration of the effects varies from person to person, but I'd like to know at least a rough guideline.

For those who have actually received the injections, I would appreciate it if you could honestly tell me how much of a difference you felt.