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Jeffery, E
The needle should be inserted at a 90-degree angle for most patients, though very thin individuals may need to use a 45-degree angle or pinch the skin to ensure subcutaneous rather than intramuscular injection
Never trust vague or undated COAs, or ones with only in-house testing and no third-party backup
Stirbet et al., 2019)
First, routine screening for vitamin B12 deficiency should be incorporated into primary care for high-risk populations such as older adults, women of reproductive age, vegetarians, and patients with diabetes or chronic use of metformin or proton pump inhibitors
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