Why This Guide Is Different Many online articles simply repeat generic statements such as: All peptides last 30 days. Always use bacteriostatic water. Freeze everything. Unfortunately, peptide chemistry is far more complex
[1] Mild gastrointestinal disturbances, such as nausea, may occur
This Huberman Lab Essentials is from the full-length Huberman Lab episode, How Our Hormones Control Our Hunger, Eating & Satiety. Read the full episode show notes at hubermanlab.com

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