Warning - 40% of population has the MTHFR genetic gene anomaly (mutation) which means that your body CAN'T process B12 form and Folic Acid [cheap chem form of FOLATE!] You'll get NO benefit and nay even do harm over time. There's a reason why so many vegans are very sick - lack of B12 supplementation. Taking B12 you can't absorb in cheap shelf-stable cyanocobalamn form isn't just peeing it out, but creates other issues. A body NEEDS B12 and Folate to kick off critical combination of these two nutrients which sets off next stages of 'methylation cycle' responsible for regulating everything from getting blood waste out, dopamine/serotonin regulation, prevention of various short and long-term illnesses over one's lifespan. Unless you know that you don't have this mutation - AVOID anything with cyanocobalamin and Folic Acid [especially if planning pregnancy at some point or if having m miscarried at some point]. Remember that FDA requires all flour to be fortified, so consider how it's in baked goods, pasta, etc. It's not that these two nutrient forms are just useless, but cyanocobalamin continues to float around blood giving 'too high/ok' B12 blood test results when you're actually B12 deficient (B12 deficiency may result in pernicious anemia and, worst cases - misdiagnosed as schizophrenia). Folic Acid isn't used, but actually absorbed quicker in the gut than correct form, thus blocking FOLATE from getting in.
I bring painful miscarriages topic specifically because many result from folic acid shrinking capillaries and blocking delivery of bood/nutrients to the growing fetus which ends in miscarriage. Addition of a baby aspirin is a clumsy workaround to thin blood. With Genome Project's understanding there is no need to resort to this draconian shortcut. Folic Acid fortified products/food is banned for import in over 156 countries so far and growing. MTHFR issues cover more conditions than I can list here including autoimmune and hormone conditions. It's a simple blood test or a swab for kids. Comprehensive genetic test includes it. For now, unless you are sure - avoid anything with these two forms of vital nutrients.