Blends™ never uses preservatives in its compounds. All Blends™ topicals are made fresh in small batches, and use a proprietary anhydrous gel base which naturally helps keep the products stable. Many other brands such as Rogaine©, as well as other online hair loss medication companies use the preservative Propylene Glycol in their topical products. Propylene Glycol, the active ingredient in antifreeze for your car, is very harsh on the skin and commonly leads to rashes and irritation, and in some cases significant shedding. Blends™ was founded by hair restoration surgeons who have seen first hand many complications caused by this ingredient, and set out to find a way to naturally preserve their formulas long enough without the need for such harsh chemicals.
Other preservatives commonly found in other companies products include Citric Acid and Ethanol (alcohol). These perservaties can strip hair of oils leading to a dry/flaky scalp and brittle hair.
When choosing a topical compound to treat hair loss, we highly recommend you make sure it is preservative free and does not contain Propylene Glycol, Citric Acid, or Ethanol.