I stopped getting my cycle both times Ive run sarms. (Ostarine and S4)
Basically i ran the ostarime for 8 weeks (no period) after about 3 weeks off I got it. Started the s4 about two weeks after that and havent had one yet, its been around 4 weeks now (still running the s4) I guess it could just be due to my training more than the sarms itself, but I was having regular cycles prior to this.