This is non sense. You can fast 20 hours a day and still maintain all muscle mass. You can so the same with roughly a 14-16 hour fast with regards to muscle building.
It may have helped you, but that's a costly and illogical amount to take. I take 5,000 iu every other day and feel great. Some weeks I skip it just to mix things up. In my experience, 5,000 just makes me feel less healthy in the scope of numerous health domains.
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