4 weeks are definitely too few if you want to feel any considerable improvements with your joints. You need to run it for at least 8-10 weeks for that. It is a very safe compound, so it is cool to use it for long periods of time. Also, you would have to increase the dosage to 25 mgs per day for maximum effects. Personally, I would also add there some N2Joint RX - this is one amazing joint supporting supplement, and when combined with Ostarine they do miracles. I have been having serious elbow joints problems for years, and nothing would help me. Then, I tried Osta with N2Joint, and the joints got better really fast, and now they feel like new.