I actually feel entirely different during Winter. I may lose a bit of "will to have fun", meaning I can grind and focus on work, education and all this stuff that literally seems impossible to do once it's summer and 30 degrees hot outside.
As far as I consider vitamins to be a great addition to your diet, what usually works much better as mood booster for me is a proper workout. Seriously, hitting the gym and lifting iron hard can be a game changer and most importantly hard workout always leads to LIBIDO increasement. Well, unless you overwork yourself both mentally and physically, then it's even worse, but as we live in 2017 lack of physical activity is a very common cause of any depressions, low libido etc.
As far as I consider vitamins to be a great addition to your diet, what usually works much better as mood booster for me is a proper workout. Seriously, hitting the gym and lifting iron hard can be a game changer and most importantly hard workout always leads to LIBIDO increasement. Well, unless you overwork yourself both mentally and physically, then it's even worse, but as we live in 2017 lack of physical activity is a very common cause of any depressions, low libido etc.