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Vitamin B12 & B Complex Drips and Shots: What They Help With and How They Work Samantha Pieterse Jul 15, 2025 8 min read Updated: Feb 11 Tired, Unfocused, or Moody

At a 20mg/mL concentration, maintenance doses stay in the comfortable range: 8mg requires 0.4mL (40 units) and 12mg requires 0.6mL (60 units)

For general symptoms, please advise your provider

In this case you may experience symptoms including: Weakness, tiredness, or lightheadedness Heart palpitations and shortness of breath Pale skin A smooth tongue Constipation, diarrhea, loss of appetite, gas Numbness or tingling, problems walking Vision loss Experiencing depression, memory loss, or behavioral changes Those who are deficient but not anemic may also experience symptoms, such as: Fatigue & weakness Low moods Decreased concentration level Loss of appetite Constipation Poor memory How to Increase your B-12 Thankfully, there are a few ways you can get the essential vitamin into your body to help improve your overall body function