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Since lips do not have much protection, the effect of sunlight is stronger

Nausea and Vomiting: Common side effects include severe nausea, vomiting, and facial flushing

Kraemer WJ, Spiering BA, Volek JS, Ratamess NA, Sharman MJ, Rubin MR, et al

(2005): Improved insulin sensitivity in prediabetic adults

Lancet 366, 11111120

A 2015 review in the Journal of Clinical Endocrinology confirming that GHRH analogs combined with ghrelin-pathway agonists produce a synergistic GH secretory response that exceeds additive effects when either compound is used alone provides the mechanistic basis for why combination therapy is the standard in supervised clinical settings