While research indicates that it does not significantly impact growth hormone levels, IGF-1, or glucose metabolism, long-term studies on its safety are still limited
Additional research has demonstrated that correcting vitamin D deficiency can, in itself, increase glutathione levels and vice versa
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A valid before-and-after comparison requires: identical lighting (same source, same angle, same intensity), identical camera settings, identical distance from subject, no change in makeup or skincare layering, and a defined timeframe with a single variable changed
DOI: 10.1016/j.chom.2013.03.010 8
However, caution is warranted here