Is it worth taking peptides for height for a 16 year old female who needs to be taller?

Unlikely to matter: Proper basic diet, rest & exercise are the only support needed for proper growth. At 16 most girls have little if any growth potential left because the bone growth centers are closing. An x-ray of the left hand/wrist can be analysed for bone maturity.If the growth centers are open, more growth is possible, if closed, you're done.