Can you tell me if i could use probiotic without asking doctor?

Yes : Sure you can. Two caveats: If you are prescribed a course of antibiotics by a physician, be sure to tell him/her about your probiotic usage. Also, when asked what medications and supplements you take, be sure to mention the probiotic.

Quick answer, yes.: But it's funny because you're actually asking a doctor right now. Probiotics are safe and can be taken safely as an over the counter supplement.