Citric acid directly metabolizes to oxaloacetate in the body. This guy is selling you fruit juice at $50 bucks an orange.
I asked BenaGene, a company that also sells Oxaloacetate, why, if citric acid directly metabolize to oxaloacetate, I should take its product rather than having a bit of lime juice every day. I received the following response:
Back when the "antioxidant" theory was big, there were several lifespan studies done with various antioxidants including Citric Acid (citrate) and ascorbic acid. There was no increase in lifespan.
While under certain conditions oxaloacetate can convert to citrate, and vice versa, it does not create the conditions we want. ...
For those who are interested in this topic, I'm just wondering what longevity research today looks most promising to you and why. Whether that's SENS, cryonics, nanotech, brain uploading, etc is fine with me. Any links to actual research papers would also be greatly appreciated. I'm very interested in longevity, and am curious to see if anyone else would like to offer some thoughts on the current state of the art.