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However, NEXAPH distributes this product exclusively through its official store to maintain transparency, quality control, and brand integrity

Do not stop taking it until you have finished the complete course, even when you feel better

And to get back to the point here, the original poster mentions a low B12 level and receiving treatment for same, but not taking any additional B vitamins so the simplest explanation here is that they are experiencing neurological damage from B12 deficiency, rather than anything to do with B6

Optimising treatment outcomes may be facilitated by addressing nutritional deficiencies

You should start to notice a difference in a few days a week and can take up to 2 weeks to feel maximum effect