Can all liquid supplements be used sublingually?

[Vvs1]

I didn't find any sublingual specific vitamin D, so I ended up with liquid vitamin D drops.

Is there any reason why any liquid supplement, such as my vitamin D, cannot be absorbed sublingually? Or will all be absorbed if I hold it under my tongue, or on my tongue?

 

[Deleted member 16042]

Yes, there are reasons not all liquids are effective sublingually.

Positive Health Online | Article - Sublingual Absorption

http://www.pharmtech.com/considerations-developing-sublingual-tablets-overview

However with something like Vit D, if you eventually swallow it anyway, you get your dose.