Below are possible Vitamin B12 deficiency symptoms: Weakness, tiredness, or lightheadedness Heart palpitations and shortness of breath Pale skin A smooth tongue Constipation, diarrhea, loss of appetite, or gas Nerve problems like numbness or tingling, muscle weakness, and problems walking Vision loss Mental problems like depression, memory loss, or behavioral changes You can also get vitamin B12 deficiency if you follow a vegan diet or you are a vegetarian who doesn't eat enough eggs or dairy products to meet your vitamin B12 needs
The most common starting protocol is 250 mcg twice daily

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Recommended Timing Protocols Morning Fasted Protocol (Most Common): Timing: Upon waking, before any food or caloric beverages Fasting Window: At least 8-10 hours fasted from overnight sleep Post-Injection: Wait 30-60 minutes before eating breakfast Activity: Light fasted cardio or morning routine before first meal may enhance fat mobilization Advantages: Convenient, consistent daily routine, maximizes overnight fasted state Pre-Exercise Protocol: Timing: 30-45 minutes before fasted cardio or training session Fasting Window: At least 4-6 hours since last meal Rationale: Exercise during fasted state with elevated free fatty acids may enhance fat oxidation Considerations: Not suitable for high-intensity training
Lafond et al., showed that decreased Mn levels in seminal plasma from men with diminished sperm densities [182]