There are various methods to measure the antioxidant activity of a compound or sample test, for example, DDPH radical scavenging activity, ABTS assay, TEAC, TRAP, FRAP assay, Superoxide radical scavenging activity (SOD), Hydroxyl radical scavenging activity, Hydroxyl radical averting capacity (HORAC) method, Oxygen radical absorbance capacity (ORAC) method, Reducing power method (RP), etc. What in vitro antioxidant method is the most relevant to biological antioxidant activity (in vivo)?