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This could happen due to: Persistent underlying conditions that hinder absorption
As for safety, tolerable upper intake levels (known as ULs) are set for vitamins and minerals when evidence is sufficient
Some individuals may also experience an elevated heart rate or trouble sleeping [3]
What's included in the program
Before starting, a provider should review your health history, medications, allergies, wellness goals, and whether lab work may be useful
Stengler: So how can vitamin B12 shots help you
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