Vitamin D supplementation for obese adults undergoing bariatric surgery

To compare the effects of different doses of vitamin D supplementation (low dose ≤ 600 IU daily, moderate dose between 600 and 3500 IU daily, high dose ≥ 3500 IU daily, compared to each other or to placebo) in obese adults undergoing bariatric surgery.

This is a protocol.

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