Hi mama! Honestly, most brands ng sodium ascorbate work the same way kaya kung available lang sa Mercury or sa trusted pharmacy mo, okay na yun, ang importante talaga ay consistent ka sa pag-take for your pregnancy. A few of us moms just grabbed whatever brand ang available (Lupin, Pharex, generic ones) at walang problema, so huwag mag-alala kung hindi exactly yung United Lab, sigurado lang na genuine at mula sa trusted pharmacy. If you want to be extra sure, you can always text your OB kung may specific brand siya na mas gusto, pero usually sabi namin the pharmacist can recommend a good equivalent!