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[URL unfurl="true"]https://www.excelmale.com/forum/threads/nandrolone-atrophy-in-quads-also-legalities-and-terminology.21377/post-182790[/URL]

Just wanted to link this here in case other folks have run into this.  To [USER=13851]@madman[/USER] 's comment, the higher you run nandrolone the higher you may risk potential beta receptor issues with the heart.  From my linked post above:

Concern I have is medium/long term use of nandrolone and its effect on beta-receptors / beta adrenoreceptor action in the heart.  I can post the rodent models (easy to look up on google) but obviously no human data.  I posted my experience over on another forum but I can tell you experiencing afib in the middle of the night is no fun and it came out of nowhere.  Can I prove it was the ND?  Nope.  There may have been synergistic effect of TRT + T3 + T4 + prior ND + prior oxandrolone usage + HIIT + getting to the age where high intensity exercise may lead to afib.  Just a word of caution if you work out hard, take testosterone, also use combination Thyroid therapy, and introduce ND, which is shown to upregulate beta receptor activity in the heart of mammals.  Do you have pre-existing arrhythmia?