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One study reported a case of a 48 year-old woman with motor weakness, dementia, sensory disturbances, and widespread coarse hair classic B12 deficiency symptoms

If you notice worsening rather than improvement, discontinuing use and reassessing is appropriate

Headache: Some people experience mild headaches following the injection

Niacinamide (Vitamin B3) Evens skin tone, minimizes pores, strengthens skin barrier

In cats, it is most common for B12 to be supplemented by a subcutaneous injection under the skin

KPV is a cream (the 3 other peptides are injected) and carries the most modest claim of the group: an anti-inflammatory fragment tested mostly in mice with inflamed colons