Not everyone does, but labs can be helpful especially if fatigue or suspected deficiencies are part of the story
Research Focus : Safety & Metabolism (Non-Clinical) Title : Safety and Metabolism of AOD9604, a Novel Nutraceutical Ingredient for Improved Metabolic Health (J Endocrinol Metab, Vol 4, No 3, June 2014) Authors : Margret I
That's the standard the rest of the industry should meet
Water retention or mild bloating: Small amounts of fluid retention can occur when starting peptide analogues of growth hormone because growth hormone causes sodium and water retention in the tissues, resulting in slight puffiness or bloating
Effects of Tesamorelin on non-alcoholic fatty liver disease in HIV
While some patients might note transient mild fatigue or a brief period of mental haziness post-injection, its typically not of significant concern