The whole point is getting a reliable amount of B12 into your system without relying on your gut to absorb it
The symptoms of a B12 deficiency are not necessarily any different between males or females
The 10mg vial is ideal for the Phase 1 starting dose
These include: Neurological symptoms : tingling or numbness in hands and feet (peripheral neuropathy), difficulty walking or balance problems, memory difficulties, or mood changes including depression Haematological signs : persistent fatigue, weakness, pale or jaundiced skin, or shortness of breath Glossitis : a sore, red, smooth tongue Cognitive symptoms : difficulty concentrating, confusion, or "brain fog" Seek urgent medical attention if you experience rapidly worsening neurological symptoms, significant difficulty walking, severe paraesthesia, or marked cognitive decline, as these may require immediate assessment