My understanding, taken from this resource and other readings on the subject: https://sciencebasedmedicine.org/a-call-for-caution-on-antioxidant-supplementation/
You don’t need to worry about antioxidants supplements unless your doctor tells you to take them. They don’t seem to have much effect on a healthy person, as your body is able to handle free radicals just fine. In fact, you need some free radicals for some chemical processes in your body.
Your body is extremely effective at reducing chemicals down to more usable stats. Even highly toxic and caustic chemicals will get reduced down, but they may damage the cells doing so in the process. MUCH more effective than those antioxidant marketing would make you believe.
At any one moment your brain is filled with free radicals in the form of container-less neurotransmitters. These are highly reactive chemicals; pure dopamine and serotonin are not easily reduced, or rather, can’t at all be, and such an injection would be lethal. Hence why we can only use NT-like drugs for treatments, to balance, or to mimic.
The free neurotransmitters get scooped up and cut into more easily managed chemicals which are then recycled.
A free radical which your body can’t take care of in some manner is called a toxin.
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