References:

Liquid supplements show an absorption rate of 98% while powders / capsules / solids can range from only 3 to 30%. 

The National Advisory Board states that 100 mg consumed in a solid form (tablet / capsule / powder) translates into a concentrate of only 8.3mg or 8.3% in the blood. Not only are liquids more efficiently absorbed, but they are also absorbed faster as they're readily assimilated. (PH Bennett, S Haffner, BL Kasiske, WF Keane, CE, National Advisory Board, - Am J Kidney Dis, 1995) (1)

The Physician's Desk Reference states that 85-90% of nutrients in a liquid supplement are absorbed in 22-30 seconds. Physician's Desk Reference (page 1542, #49) (2)