Is there a limit on how much liquid vitamin b12 with folic acid you can take in a day?

Yes there is...: Overdosing on folic acid can prevent the development of megaloblastic anemia, without correcting the underlying vitamin B-12 deficiency, Symptoms of vitamin B12 overdose include itchiness on different body parts, numbness, improper heart functioning, giddiness, regular headaches, increasing the risk of getting cancer (see: http://www.newhealthguide.org/Vitamin-B12-Overdose.html)