The following table summarizes common claims and their evidence basis: The key pattern: most benefits are real only for individuals who are actually deficient in B12
Most people with Hashimotos have numerous micronutrient deficiencies
Some community sources describe early scalp or skin "feel" changes (a copper-peptide skin-conditioning impression carried over from GHK-Cu use, PMID 29986520) rather than measurable hair change
The response time to B12 injections can vary based on the individuals level of deficiency and overall health
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Some even claim B12 shots improve the appearance of their skin, hair and nails
