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Question: If my methionine is high, do I need to worry about betaine?
If your methionine is on the higher side then it's probably the case that you don't really have an issue with recycling homocysteine to methionine. TMG's role in methylation is to support the recycling of homocysteine methionine. So if your methionine levels are on the high side of normal then you probably don't need TMG, but I'm also not sure what you mean by methylation issues.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.