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The mechanism involves a larger number of hair follicles entering the resting phase prematurely, leading to increased shedding and subsequent thinning of hair

CrossRef A Clinical-Imaging Nomogram for Predicting Early Recurrence in Patients with Solitary Hepatocellular Carcinoma After Postoperative Adjuvant TACE Jiachen Liu, Xiurong Ding, Yanyan Zhang, Hongjun Li Journal of Hepatocellular Carcinoma .2025

The strongest support comes from clinical evidence focused on treating vitamin B12 deficiency, not from general wellness claims What science supports The NIH Fact Sheet for Health Professionals shows that intramuscular B12 injections are effective at raising blood B12 levels and correcting deficiency

For a large peptide like retatrutide that absorbs slowly, this limited window is a significant constraint