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I'v not had this experience, but it sounds alarming and distressing

Food for Thought: What Other Vitamin Deficiencies Can Cause Hair Loss

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In research settings, it is commonly used: As a diluent or vehicle for certain compatible research compounds For reconstitution of lyophilized materials in non-clinical experiments In applications that may require multiple withdrawals from the same container when aseptic procedures are followed The 30mL container format offers convenient volume for repeated use in small to moderate-scale experiments, providing flexibility for ongoing or multi-step protocols

Vegetarians who eat dairy and eggs have some B12 intake, but may still fall short of adequate levels