——— The following studies are funded by organizations with financial interest, and/or are biased or of poor quality:

https://academic.oup.com/ajh/article/21/3/310/102286 - This study was financed in part by Howard Settle
https://link.springer.com/article/10.1007/s11906-007-0094-3 - This study is published by the for profit organization of TM, Maharishi University of Management
https://www.liebertpub.com/doi/abs/10.1089/acm.2013.0204 - This study is published in a poor quality journal

——— The following studies hold to scientific methods:

https://link.springer.com/article/10.1007/BF03040500
“ The claim that TM has a specific and cumulative effect on cognitive function is not supported by the evidence from randomised controlled trials. ”

https://journals.lww.com/jhypertension/Abstract/2004/11000/Insufficient_evidence_to_conclude_whether_or_not.2.aspx
“ Insufficient evidence to conclude whether or not Transcendental Meditation decreases blood pressure: results of a systematic review of randomized clinical trials ”

https://thorax.bmj.com/content/57/2/127
“ There is some evidence to suggest that muscular relaxation may warrant further investigation for the improvement of lung function in asthma patients, but the evidence for hypnotherapy, autogenic training, biofeedback, and transcendental meditation is less promising. ”

——— Editorials with links to studies:

http://transcendental-meditation-honestly.blogspot.com/2009/12/transcendental-meditation-coherence-lie.html