Will getting hair loss injections help reduce hair loss?

My husband's family has thin hair and a genetic history of hair loss, so I'm worried.
I have been massaging my scalp using hair loss shampoo and a scalp brush, but I heard that there are also various types of hair loss injections available these days.

Are hair loss injections really effective? Are there any side effects when getting hair loss injections?

Having thick hair is really a blessing.