The 3-bottle pack sits in the middle of the range at $69 a bottle, with free shipping.
At $207 for a stated 90-day supply, the pack works out to about $2.30 a day by our arithmetic. Against the $79 regular price, three bottles would cost $237, so the saving is $30.
It also lines up with the lower end of the brand's suggested 90 to 180 days, which the 2-bottle pack does not reach.
The guarantee still ends at 60 days, so you cannot judge a full 90 days before the refund window closes. Whether it is worth it depends on how confident you are, how you will track results and whether you are comfortable with $207 spent before day 60. Confirm the price and terms at checkout.