Possible additional discounts using Subscribe & Save where available.
Here's the SD public service announcement version: Amazon[amazon.com] has select Buy 1, Get 1 Free Vitamin/Supplement Products on sale listed below. Shipping is free w/ Prime, on $25+ orders, or while Subscribe & Save (select the later date from the "First Delivery On" menu) is available.
Note, be sure to add quantity of 2 for promotion to apply at checkout. You can mix & match; lower priced item will be free. You may cancel Subscribe & Save any time after your order ships.
Here's an updated list of Example Deals (eligible products subject to change):
Prices after multi-buy discount: