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Pretty much every article with instructions that you would find on using apple cider vinegar for weight loss would specify 5-6 percent concentration, about the concentration used in vinegar and oil salad dressing.

Thread diversion and Chemistry for fun and education! Acetic acid at concentrations of 99% or higher it freezes at about 60 degrees. (Ethanoic acid.) And yes, can be dangerous. (As you already know!)

Click and go to place on video showing picture of "frozen" ethanoic acid (left bottle.)

https://patientsafetyj.com/article/116280-what-to-know-about-glacial-acetic-acid-stop-using-it

Multiple events involving patient harm from the use of undiluted glacial acetic acid have been reported to the Pennsylvania Patient Safety Reporting System (PA-PSRS). Glacial acetic acid is anhydrous pure acetic acid available in concentrations between 99.5% and 100%.1–4 Unlike acetic acid solutions which have various medical uses when diluted to different concentrations (e.g., 0.25% for irrigation, 2% for otic use), glacial acetic acid is highly corrosive; has no medical purpose; and has been associated with serious patient harm, such as severe tissue damage and third-degree burns.1–4

and also:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4589881/