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Some studies report subtle benefits as part of multi-nutrient interventions (B12 + folate + B6 + D), but the effect sizes are small and the contributions of individual nutrients are hard to isolate
Studies have identified significant reductions in testosterone levels in males over the past few decades, independent of age
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Older Adults: As we age, stomach acid production can decrease, making B12 absorption more challenging
an injection skips the gut entirely and delivers a full, reliable dose
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