The 6-bottle package carries a specific value worth understanding precisely: the lowest cost per bottle among the three package sizes, plus free shipping.
$49/bottle for a 180-day supply, totaling $294, with free shipping — against the $79/bottle price on the smallest 2-bottle package, a difference this site labels as "38% Saved."
Given this site's own materials describing most users noticing a difference within 2-4 weeks, a 180-day supply gives genuine room to evaluate fairly well beyond that window, without running out mid-evaluation.