I've been using this one:

https://www.amazon.com/Probiotic-PreforPro%C2%AE-Enhanced-Biotics-acidophilus-bacteriophage/dp/B01NAE7J7B/ref=sr_1_21?dchild=1&keywords=Bacillus+subtilis&qid=1589643875&s=hpc&sr=1-21

No miracles appeared. Actually a thing that really worked would still be hard to observe objectively. All I can say is there's no apparent risk to this one so it won't hurt to try