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The use of peptides is currently unregulated, creating a "wild westish" situation, and the main concern is not the peptides themselves, but how they are being made available to people, which could potentially harm them or cause them to be overlooked as useful compounds 10s

The neurovascular unit coming of age: a journey through neurovascular coupling in health and disease

Severe COVID-19 is marked by dysregulated serum levels of carboxypeptidase A3 and serotonin

In recreational athletes, supraphysiological GH doses are often used either alone or in combination with other doping substances (140), and studies have shown that GH improves anaerobic sprint capacity, but not strength and endurance (141), and increases GH, IGF-I and fasting insulin levels (142, 143) mimicking those seen in acromegaly patients ( Table 1 )