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While sublingual and oral spray formulations are available, there is no robust evidence that they offer superior absorption compared to standard oral tablets
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Because oral glutathione is subject to significant degradation in the gastrointestinal tract, intramuscular delivery may offer improved bioavailability for patients whose clinical evaluation suggests a role for antioxidant support
The speed of response depends on how low vitamin B12 levels were before treatment and how long deficiency had been present
For less urgent concerns such as persistent injection site pain with spreading redness or unexpected symptoms, contact your GP or call NHS 111
