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It does have negative side effects: https://en.wikipedia.org/wiki/Oxygen_toxicity

The negative effects may be the very reason why it works, as it has an hormetic response https://en.wikipedia.org/wiki/Hormesis similar to fasting.

There’s a couple theories running around out there about amplifying programmed cell death as a rejuvenating strategy. If you can avoid telomere shortening in the process, it might work.

It’s an interesting Ship of Theseus style problem, though. Replacing all the pieces faster, am I still “me”?

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