The most important difference between these two types of tincture is the presence of THC. Broad-Spectrum CBD Tinctures are 0.00% THC. They will not cause you to fail a drug test. Full-Spectrum CBD Tinctures contain trace amount of THC (under 0.3% THC). This will not get you high, but it may cause you to fail a drug test.
-750mg: 15mg per serving (small dose)
-1500mg: 50mg per serving (medium dose)
-3000mg (1 oz. tincture) & 6000mg (2 oz. tincture): 100mg per serving (large dose)