In genetics, an alloantigen is an antigen, present in only some individuals of any species, which stimulates the production of antibodies in those who lack it.

stimulates growth harmone and builds stong bones and in old individuals prevents bone loss. It's a mineral

Vaccines stimulates the immune system to make antibodies

"Stimulates" is a verb. It is the 2nd person singular, present tense. "He, she, it stimulates."

Oestrogen stimulates the hormone LH. LH is secreted in pituitary gland and stimulates the release of an egg