The 6-bottle package carries a specific value worth understanding precisely: the lowest cost per bottle among the three package sizes, plus free US shipping.
$49/bottle for a 180-day supply, totaling $294, with free US shipping — against the $79/bottle reference price shown on the smallest 2-bottle package.
Given this formula's own materials describing best results building around three months of consistent use, a 180-day supply gives genuine room to evaluate fairly well beyond that window, without running out mid-evaluation.