There is no benefit to taking this sublingually that I know
of. Generally the reason you take anything that way is to get it into your system as quickly as possible or because saliva is beneficial to absorption. With 5-HTP, it takes some time for your system to react to it assuming your body finds it necessary to have more coming in -- if it doesn't, it just evacuates it. The same thing is true when you take medication targeted at serotonin, though they work quit differently.