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It is generally preferable to administer reactogenic vaccines such as Shingrix and COVID-19 vaccine in different arms
Air bubbles are not dangerous for subcutaneous injections
The National Institutes of Health recommend the following daily dosage of vitamin B12: Birth to 6 months: 0.4 micrograms Infants 712 months: 0.5 micrograms Children 13 years: 0.9 micrograms Children 48 years: 1.2 micrograms Children 913 years: 1.8 micrograms Teens 1418 years: 2.4 micrograms Adult men and women 1850 years: 2.4 micrograms Adult men and women over 50 years: 25250 micrograms Women who are pregnant: 2.6 micrograms Women who are breastfeeding: 2.8 micrograms Adults over the age of 50 are at a greater risk of vitamin B12 deficiency because they tend to produce less stomach acid, which is needed to convert the vitamin properly
Annals of Dermatology , 28(4), 413419.
Adequate maternal pyridoxine levels are important for fetal development, and the vitamin is present in prenatal vitamins in amounts roughly equivalent to the Recommended Dietary Allowance (around 1.9 mg per day for pregnant women)
