Is the comma optional?

A woman fell into a coma and died after receiving Botox treatment, although it is not clear if the Botox treatment was to blame. Aesthetic doctors tell Farez Juraimi that regulations are in place for such procedures.

Is the comma before "although" optional?

Thanks.

Read more at https://www.channelnewsasia.com/news/singapore/woman-dies-allegedly-after-botox-treatment-video-11363818