b12 injection process first time Injecting What happens when you inject vitamin B12? Treating Severe Vitamin B12 Deficiency

Within 2 days the obsession with food stopped

Other patients may take a few days or weeks before noticing a significant difference

These included: Expressive communication Personal and domestic daily living skills Interpersonal skills Play-leisure skills Coping social skills Other clinical improvements observed with B12 included improvements in: Sleep Gastrointestinal symptoms Hyperactivity Tantrums Nonverbal intellectual quotient Vision Eye contact Echolalia Stereotypy Anemia Nocturnal enuresis (bed wetting) Adverse events with B12 identified by meta-analysis included: Hyperactivity (11.9%) Irritability (3.4%) Trouble sleeping (7.6%) Aggression (1.8%) Worsening behaviors (7.7%) But adverse effects were generally few, mild, not serious, and not significantly different compared to placebo

While some anecdotal reports mention noticing changes within a few weeks, many protocols suggest you should use it for at least 12 weeks to observe more significant results