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Reddit threads contain plenty of posts from people reporting no benefits, unpleasant side effects, or struggles finding reputable sources

That caution is the point

The cause of B12 deficiency, vegetarian diet, pregnancy, and breastfeeding, can impact the dosage and duration of therapy

Benefits of Glutathione IV Therapy for Skin Whitening Hyperpigmentation Reduction Glutathione IV therapy is highly effective in reducing hyperpigmentation

Vitamin B12 plays a vital role in various physiological processes, including energy production, metabolism, blood cell formation, and nerve function

Why some causes need intramuscular or lifelong treatment An injection bypasses the gastrointestinal tract