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The 72-hour threshold is not an official manufacturer guideline it's a practical working limit based on how quickly bacterial growth can become concerning at typical room temperatures (2025C) even in the presence of benzyl alcohol
At a 10mg weekly dose, it lasts 5 weeks
GHK-Cu declines 60% between ages 20 and 60: this is not a cosmetic add-on
Understanding how B12 functions in the body is important context before evaluating claims about its role in weight loss
doi: 10.1016/j.bbrc.2018.09.004 180 GaoJLiuQLiJHuCZhaoWMaWet al
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