A 2009 japanese study on Apple Cider Vinegar ACV cleared many things about its weight loss properties. After first month of taking people not only started to lose weight but also lowered their blood sugar, cholesterol and tryglicerides. Unfortunately the weight loss was only 1kg or 2.2lbs after 2 months of taking 30ml of ACV per day, that's a big quantity of ACV for so low results.
In conclusion ACV helps in the weight loss process but it must be accompanied with exercise and a healthy diet. Also there's more precautions and things I can't mention for lack of space but all the information I shared I found in this ACV article. Also they have other article that talks about many weight loss supplements and how effective they really are that could help the ACV effects in synergy.