Hi Lee Anne,
Here is a link to a fabulous overview/report on Pyrrolizidine containing herbs.
https://research.torrens.edu.au/ws/portalfiles/portal/26498674/Pyrrolizidine_Alkaloids_Final_Report_April_2019.pdf
This would be good for anyone who is considering using these herbs internally to read over. In this report you will find lots of research data and information, and you will also find that it is still quite a debated topic. At the end of the day if you say your formula works well without the borage or you could put something like licorice or ashwagandha in to further support adrenals, this may be the best way to put your mind at ease on the safety of the formula.
Warmly,
Benna