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Then B12 shots can be helpful monthly as maintenance

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While Epithalon did not significantly influence food consumption, body weight, or mean life span, it did slow down the age-related switching-off of estrous function, decreased the frequency of chromosome aberrations in bone marrow cells, and significantly increased the maximum life span (by 12.3%) and the life span of the last 10% of survivors (by 13.3%)

What if I want a different target concentration