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Higher doses dont necessarily improve results and may increase the risk of side effects

It is possible to have too much Vitamin B12 in your system and taking too much can cause side effects such as insomnia, headaches and gut issues

The most common adverse reactions are related to gastrointestinal adjustments and administration site responses with subcutaneous injection protocols

[10] [12] The administration of Ascorbic Acid (Vitamin C) Injection is generally well tolerated, but adverse effects may occur, particularly at high doses or with prolonged use

These reports have not been confirmed in controlled settings

B12 Injections vs Tablets Whats the Difference