I am 21 years old if my growth plates are still open can i use hgh supplements to grow taller?and how is hgh defficiency diagnosed are there symptoms?

Unlikely to happen: Data on fail to show that those with normal but delayed growth achieve a height any taller than they would waiting for nature to complete the process.Supplemental hgh can let you increase the speed of getting there, but not the final height. I would only consider it if your bone age on x-ray showed open growth centers. Deficiency is diagnosed by timed blood tests and hormone stimulation tests.