Nausea, mild GI upset, or dizziness (especially with oral or highdose forms)
Here are the main signs and symptoms of B12 deficiencies that show up at this stage of life: Tiredness and fatigue Difficulty thinking or memory issues Low moods such as apathy, depression, or irritability Digestive complaints Issues staying asleep Feeling like your heart is racing and pounding Other common complaints include Numbness, tingling, or other altered nerve like sensations in your body such as burning feet Clumsiness, balance, or gait problems Development of tremors Vision changes Feeling light-headed, weak, or dizzy Feeling short of breath Having an inflamed red tongue Loss of appetite Cardiovascular complications Bone loss You can assess your B12 levels in a few different ways You can test B12 on its own and depending on where you live in the world this range varies significantly, which is insane

The preference for using oxidative phosphorylation (OXPHOS) to meet energy demands, and the resulting increase in reactive oxygen species (ROS) has been shown to be a targetable vulnerability of MNA cells (8, 12, 13)
Vitamin B12 injections are used to treat these by raising B12 levels and possibly fixing some nerve damage
When you use the same needle over and over, the tip can get dull, hurt, or get infected
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