99% means less than 1% impurity content - pharmaceutical grade
These are not hypothetical problems
Higher-Caution Situations Extra medical supervision is important if you: have a history of reactions to injectable vitamins/cobalamins have significant kidney or liver disease are pregnant or breastfeeding are offered a compounded MIC B12 product without clear labeling of ingredients, concentrations, and compounding source The FDAs overview of compounding helps explain why quality can vary (see Compounding and the FDA: Questions and Answers )
Treatment with GLP-1RAs reduced inflammatory cell populations, pro-inflammatory cytokines within BALF, and pro-inflammatory cytokines in lung homogenates across multiple allergen and injury models including Alternaria , house dust mite (HDM), and ovalbumin aeroallergen challenges, and bleomycin or virus-associated lung injury [65, 66, 102,103,104,105,106,107,108]