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Webmd.com

Nasal spray has only 30 to 40 percent bioavailability compared to roughly 100 percent for subcutaneous injection

Liu T, Jiang L, Tavana O, Gu W

Synthetic hormones, in contrast, are not identical in structure and function to those produced by the human body

Furthermore, copper peptides are believed to play a part in the body's overall maintenance and wellness by supporting nervous system function and potentially aiding the repair of nerves and brain tissue

It can also increase insulin levels and sex drive, provide greater physical strength, improve stamina, detoxify the whole body and lower cell damage in people with fatty liver