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Both quietly undo a lot of progress, even when your dose and consistency are otherwise right

There is limited evidence suggesting direct effects on hormone levels
These bubbles create foam on the surface and can make it difficult to draw an accurate volume, because air pockets in the syringe displace liquid

Kwong JC, Carr D, Dhalla IA, Tom-Kun D, Upshur RE: Oral vitamin B12 therapy in the primary care setting: a qualitative and quantitative study of patient perspectives
