I don't really know what is available to you in the Philippines.
Just make sure you get something that meets the recommended intake. Though recommendations vary slightly between health authorities in different countries, and between veg*n advocacy groups, which suggests B12 intake is not a very exact science yet.
For people of age 14 to 64 the website veganhealth.org (run by registered dietician Jack Norris) lists the following recommendations:
Either 2.4 migrograms per day (the amount recommended by USDA), or two doses of 2 - 3.5 micrograms per day, or a single dose of 25 - 100 micrograms per day, or a single dose of 1000 micrograms per week.
If you're drinking dairy milk, there is some B12 in that. If you're drinking soya or other plant milks, there may be a little in that. (It will be listed in the ingredient list.)