Unverified80% confidenceDecision RuleTime unknown
B12优先选甲钴胺(methylcobalamin)或腺苷钴胺,避免氰钴胺(cyanocobalamin)——氰钴胺需肝脏转化且含微量氰基,50岁以上及胃酸不足人群转化效率更低
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80%
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Long-term
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UnverifiedB12优选甲钴胺(methylcobalamin)或腺苷钴胺活性形式,氰钴胺(cyanocobalamin)需经肝脏转化且含微量氰基,对老年人和吸收能力弱者活性形式利用率更高92% similarUnverified活性型B12优选甲钴胺(methylcobalamin)或腺苷钴胺,而非氰钴胺(cyanocobalamin),前者无需肝脏转化、生物利用度更高,尤其适合中老年及吸收功能下降者92% similarUnverifiedB12优先选甲钴胺(甲基钴胺素)或腺苷钴胺等活性型,吸收利用率高于氰钴胺(cyanobalamin);氰钴胺需经肝脏转化且含微量氰基,长期大剂量对肾功能不全者不友好90% similarUnverifiedB12(钴胺素)优先选甲钴胺(methylcobalamin)而非氰钴胺(cyanocobalamin),甲钴胺为活性形式,生物利用度更高,尤其适合肝肾功能不佳或吸收障碍的老年宠物90% similarUnverifiedB12建议选甲基钴胺素(methylcobalamin)或腺苷钴胺素而非氰钴胺素(cyanocobalamin),活性型无需体内转化、生物利用度更高,尤其适合老年人及吸收不良者89% similar
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