[Myrddin]

Irisin injections.

As long as introducing external irisin doesn't result in suppressing normal generation in your body. That may well suppress levels making it harder to derive a benefit from exercise.

[Bloody Sam Roberts]

As long as introducing external irisin doesn't result in suppressing normal generation in your body.

I know nothing of irisin but I look at it as a TypeII diabetic on insulin. It acts as a supplement for the normal or limited pancreatic production of insulin.