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Medications such as metformin (used for diabetes), which interferes with vitamin B12 absorption

The twice-daily approach Morning: Cleanse copper peptide serum moisturizer SPF 30+ Evening: Cleanse copper peptide serum other actives (like retinol, 23 nights per week) richer night moisturizer Daily SPF is non-negotiable

For these individuals, vitamin B12 injections are often the most effective way to restore healthy B12 levels because they bypass the digestive system entirely, delivering the vitamin directly into the bloodstream for maximum absorption (around 95% compared to 25-50% for oral supplements)

There's no need to wait 4 hours between treatments