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Safety Considerations: Vitamin B12 injections are generally safe when administered by a healthcare professional at Hampton Health & Wellness Centre
This efficacy limitation, rather than safety concerns, halted further development
Short-term safety is well-established at doses up to 1200mg per day, but chronic daily supplementation may downregulate endogenous glutathione synthesis through negative feedback on gamma-glutamylcysteine synthetase
Myth: More milligrams always mean better results
The studies demonstrated that long-term supplementation is responsible for an increase in blood glutathione levels (3)
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