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

It is a close structural analogue of the naturallyoccurring GHK-Cu (Copper Tripeptide1), differing only in a single Nterminal residue: alanine in place of glycine (one methyl group)
Hydrocortisone Hemisuccinate 14
Avoid the soap entering into eyes, nose or mouth
CJC-1295 vs Ipamorelin: What Is the Difference
Some of the best sources are organ meats, particularly liver and kidneys from lamb, beef, and chicken, which are extremely high in B12