How to boost collagen in our face skin?

I'm 29 years old and made a lot stress and thought about die. after do this depression, in a short time like 2-3 months, my face looked a lot older than i am. i researched about this problem and found collagen in the face skin are produces slowler than before and it causes make you look older. i have a sagging skin now which i dont have before that depression and i hate this problem and can't find a solution :(

I tried to get Vitamin C with my meals to boost producing collagen but no enough solution. but i feel my skin tighter when i get vitamin C with meals. but still not enough. i applied this about 2 months with eating lemons with eating meals, no luck.
Does anyone know how to boost producing collagen in our skins in a short time?

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How to boost collagen in our face skin?
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