Here is some info on the half lives of various antioxidants:
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Antioxidant Half Lives and Blood-Brain Barrier (BBB) Penetration:
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Astaxanthin 12 mg · · · · · Half life: 52 hours · Crosses BBB: Yes, easily
Vitamin C 1000 mg · · · · · Half life: 30 mins· · Crosses BBB: Oxidized form does
Vitamin E 400 mg· · · · · · Half life: 2 days · · Crosses BBB: Yes, to a degree
Grape seed extract 500 mg · Half life: 3 days · · Crosses BBB: Yes
Q10 200 mg· · · · · · · · · Half life: 1.4 days · Crosses BBB: Yes
Fisetin 100 mg· · · · · · · Half life: 3 hours· · Crosses BBB: Yes
Lutein 10 mg· · · · · · · · Half life: 15 days· · Crosses BBB: Yes
Zeaxanthin 4 mg · · · · · · Half life: 12 days· · Crosses BBB: Yes
N-acetyl-carnitine 500 mg · Half life: 4 hours· · Crosses BBB: Yes, easily
Alpha lipoic acid 200 mg· · Half life: 30 mins· · Crosses BBB: Yes, easily
Lycopene 25 mg· · · · · · · Half life: 3 days · · Crosses BBB: Yes
N-acetyl-cysteine 400 mg· · Half life: 2 hours· · Crosses BBB: Yes
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Note: I gathered the above half-life data some time ago, and I am not sure now whether it is the elimination half-life or the terminal half-life of the antioxidant, or a mixture of the two that is given.
Edited by Hip, 07 February 2017 - 05:41 AM.