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Triple-blind RCT on low Vitamin-D (<20 ng/ml) obese kids doing structured diet & physical activity - D3 50,000 vs 2,500 vs 0 IU/week - 50,000 IU improved Biceps (p=.035), subscapular (.048) skin fold thickness, ALT (p=.012), BMI Z-score, PTH, D3 - N