Reuzel Holands Finest Mens Hair Care Grooming Tonic 3.38 Ounce Create volume and texture with Reuzel Grooming Tonic. Use our hair thickening tonic when blow drying or perfecting your pompadour for a long-lasting hold. Reuzel Grooming Tonic creates a long lasting but natural feeling hold. Perfect for blow drying and all types of thermal styling,. It works great for volume and lift.