Breakfast - that is the ideal time.
Roll out of bed, take your bottle - or freshly juiced shot cup and gulp it down!
Empty stomach is best for digestion, probalby all in your 'system' within 20 minutes.
Remember an old adage.........."Breakfast like a king, lunch like a prince, dine like a pauper".
Or.........who in their right mind would plan to fill their car's fuel tank up at the end of a journey? Fill up before you need the energy!
That's what all my customers do!