How long do I keep Forth™ CBD Tincture Drops under my tongue? Customer Service February 06, 2020 21:27 Updated Follow Hold a tincture drop serving under the tongue for 30-60 seconds. But this may vary by individual. Related articles What is CBD used for? What makes Forth™ CBD products so different from competitors? What is Full-Spectrum CBD? What is a tincture? Comments 0 comments Please sign in to leave a comment.