Amino Acids to Improve Thin Skin?

I've heard that there are several key amino acids in collagen & elastin including glycine, alanine... etc. I'm 29 yrs old. I have thin, weak skin. I've just started a skincare regime including tretinoin + microdermabrasion. I have seen tablet supplemnts availble that include the key amino acids of collagen/elastin, and those products are specifically targeting improvemnt of skin, hair & nails. Is it wise for me to buy some? Any thoughts/opinions welcome. Any product suggestions?