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A bioactive collagen peptide trial reported 38% improvement in activity-related pain and 39% improvement in resting pain after 5g/day for 12 weeks

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Common experiences after the first injection include: Mild soreness or redness at the injection site (usually resolves within 12 days) Slight improvement in energy levels or mood No immediate noticeable change (particularly common if deficiency is severe) Rarely, mild side effects such as headache or dizziness Some patients report their urine becoming brighter or more intensely coloured following injection, which occurs because excess B12 is excreted renally