B12 has many functions in our body, so unfortunately a deficiency will give rise to a wide variety of symptoms, like brain fog, memory problems, cognitive impairment, insomnia, headaches, especially migraine, behavioural changes, learning problems, nominal aphasia, mood swings, irritability, depression, anxiety, hallucinations, delusions, psychosis, peripheral paraesthesia (pins and needles), numbness, neuropathic pains, poor balance, reduced vibration sense or proprioception (joint position sense), tinnitus, ataxia, taste impairment, sometimes myelopathy, fatigue, anaemia (either with larger red blood cells, or with normal size of the red blood cells when there is also iron deficiency), other reduction in blood cells, abdominal complaints, malabsorption, failure to thrive, weight loss, diarrhoea, hyperpigmentation, glossitis, (aphthous) stomatitis, infertility, urinary tract infections, joint and muscle pain, muscle weakness, spasticity, seizures, cardiomyopathy, urinary and/or faecal incontinence, postural hypotension/dizziness, erectile dysfunction, to name a few

Exp Neurol 250:239249 Li Y, Buckhaults P, Cui X, Tollefsbol TO (2016) Combinatorial epigenetic mechanisms and efficacy of early breast cancer inhibition by nutritive botanicals
No single percentage works optimally for everyone, which explains why products span such wide concentration ranges
The targeting process involves multiple steps from initial receptor binding through downstream metabolic effects
Explanation is provided as under: Chemical Synthesis (For Vitamin B1 and B6) Chemical synthesis is a method where specific chemical compounds are selected to form vitamin b1 and b6 molecules