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One trial evaluated TB4 for heart health, finding that the peptide could protect and repair the heart in patients with acute myocardial infarction, and a separate trial found that TB4 improved outcomes during congenital heart surgery.21 The review also mentions a few clinical trials related to eye health, with results showing that TB4 can reduce eye dryness, relieve ocular discomfort, lower inflammation in the conjunctiva, and more

Some work reports effects on hair follicles and hair growth, largely in preclinical models and small cosmetic studies

GHK-Cu versus other cosmetic peptides Copper peptides in skincare have become a major product category, but GHK-Cu is one specific molecule within a broader family

In those cases, nasal B12 is usually used as part of a medical treatment plan, not just a wellness add-on