Methylcobalamin is considered the best absorbed form of B12. Sublingual means you take it by letting it dissolve under your tongue, speeding it into your blood much faster than taking it in other forms.
Liquid has the advantage of being sublingual, and the disadvantage of usually having sugar in it and artificial ingredients and the further disadvantage of not being well protected from oxidation and of being difficult to know the dosage since it disperses in the carrier liquid. If you like liquid, try to find one that's natural, doesn't have sugar or artificial sweeteners, and keep it well protected out of the light.
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