Some plant-based milks, cereals, and nutritional yeast are fortified with B12, which can certainly help
You should arrange an appointment if you are currently taking Mounjaro and experience symptoms suggestive of B12 deficiency, including persistent tiredness or weakness, pins and needles or numbness in hands or feet, difficulty with balance or walking, memory problems or confusion, a sore, red tongue (glossitis), or mouth ulcers
At one point, even putting on a shirt was a painful challenge
Indeed, in humans, SSRIs only elevate serotonin release (and hence activity) moderately, inconsistently, and with a delay (38-40) - which could, in part, explain why SSRIs (and SNRIs) treat depression, OCD, and other mood disorders modestly, inconsistently, and with a delay (41-43)