No. The B vitamins are not stable in liquid form, and will lose their potency very quickly.
Be very skeptical of the quality of any Vitamin Bs or Vitamin B5 formulations on the market that are offered in a prepackaged liquid form. Ask the manufacturer for stability analysis to show you that their liquid B5 products are delivering active ingredients at the amounts exactly as they claim on product labels after a duration of time.
The best way to take B Vitamins is in tablet or caplet form.