Best gauge for oil injections are 23-25G which usually comes with 2 and 5ml syringes.

If you use needles with Gauge 21 or 22 there are more chances to have pain after injections.

Below is a needle Gauge Comparison Chart so you can know more about this subject.

To see full article with images click here: https://www.gbnstore.net/articles-ne...hart-4980.html

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That was useful . thnk you