Get a weight gainer. When I was 16-17 I used N-Large 2, too much sugar imo. Now I use Cytogainer. I am currently 6' 165 at 21. At 16-17 I was 5'10 140. Do you play a lot of sports? I used to play basketball 4-5 hours a day so I would burn a lot of calories.
-K
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