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How am I supposed to be the one that helps you here? I think this article does a good job of giving a basic tool so that you can go back and actually be helpful for that person

Even with oral supplementation, deficiencies may persist due to reduced intrinsic factor or altered digestion

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Before you buy, check for a batch-specific third-party certificate of analysis (COA), confirm the vendor tests for purity and identity (not just "in-house" claims), and cross-reference the listed mg amount against the COA's actual measured content

Chronic stress, poor sleep, and inactivity can quietly wear down your antioxidant capacity, even with great nutrition