There is no easy answer for this. It's difficult to know how much arginine you will receive from food sources. I think amino acid overdosing is relatively rare, but if you begin encountering symptoms like diarrhea, weakness and nausea these can be signs of it.
I can't say that my amino acids have ever been "put over the top" causing overdose by taking an multivitamin.
Article from BB.com:
How much should be taken? Are there any side effects?
Individuals with existing heart or psychiatric conditions should consult with their physician prior to supplementing with Arginine. With any amino acid containing product, overdose is a possibility. Dosing with too much arginine can lead to diarrhea, weakness and nausea. Clear dosing guidelines have not yet been established, so it is best to do what is known as "tolerance mapping".
Take a small dosage for one week, note the benefits and the side effects, and increase the dosage until the benefits are maximized and the side effects minimized. Over time the two will converge and you will hit the optimal dose. This process is similar to "receptor mapping" for bodybuilders who use insulin and steroids.
Many protein powders on the market are fortified with amino acids, including arginine. With this in mind, pay particular attention to how much arginine you are ingesting from sources. If you do not feel comfortable following the above described procedure, it is always best to follow the directions as prescribed on the products label.
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