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Some peptides, like MK-677, have been linked to water retention or insulin resistance in certain users

Nootropic peptides like Semax support cognitive performance and mental clarity under stress

While it is rare in the United States, vitamin C deficiency, known as scurvy, displays symptoms that are a result of weak collagen, that in turn, weakens connective tissue throughout the body

Doctors often recommend B12 injections for folks who have a true deficiency or trouble absorbing B12 naturally, not just for energy or weight goals

These highly expressed pro-inflammatory factors may cause inflammatory responses and insulin resistance, and high levels of tumor necrosis factor- are associated with the occurrence of ED [158]