Summary: Feeling worse after a B12 injection typically reflects your body adjusting to replenished vitamin levels, triggering metabolic processes that may temporarily cause fatigue, headaches, or injection site discomfort
For the first 24 to 72 hours, keep away from retinoids, vitamin C in low-pH L-ascorbic form, AHAs and BHAs, benzoyl peroxide, strong brightening agents, added synthetic fragrance, high-strength essential oils, and alcohol-heavy toners
A.CritchleyL
Settling may occur
For instance, in high-income countries, obesity risk is elevated in children from families with low socioeconomic status, while risk is greater in the higher socioeconomic strata in lower-income countries [27]
They are not interchangeable unless specifically indicated by research protocols