My b12 level is 140 but my blood count is all in normal range do i need supplements or can i increase through diet?

Try supplements : This is low enough to likely cause a variety of problems either currently or in the near future. Unless you're following a vegan diet you're likely getting adequate B12 in your diet so you likely have trouble absorbing it. While you can try more foods rich in b12, i advise taking 1000 mcg of methylcobalamin a day to raise it as soon as possible- see http://bit.Ly/1607tg3 ; http://bit.Ly/1cbhjvn.