It may degrade faster, fail to be absorbed, or produce confounding results
10.1038/s41419-020-02939-3 Cell Death Dis
For others, it can take longer, especially if symptoms have been present for months or if there are multiple contributing factors (iron, vitamin D, thyroid issues, sleep, stress, etc.)
However, genetic variants can alter the response in some people
Although initially there were some doubts concerning this conclusion, mainly due to a lack of experimental support from animal studies and insufficient epidemiological evidence, but now numerous clinical experimental studies during the last decade have vindicated the IARC conclusion
This regeneration process relies on a network of other antioxidants, particularly Vitamin C and Vitamin E