What's a scientifically plausible method for cryopreservation?

I've been working on a project and I'm trying to make it as scientifically plausible as I can get it to be. Since space is large, and it's physically impossible in this universe to reach the speed of light, people aboard spaceships would likely die before they get to the destination, or at least age.

I've been wondering if there's a plausible and safe (or mostly safe) way of preserving people as they travel through space. It doesn't necessarily have to be being preserved in liquid nitrogen or something along those lines, just anything that could theoretically work.

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What's a scientifically plausible method for cryopreservation?

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