Mederma Ingredients

Mederma is a scar minimizer produced by Merz. Available as topical gel, Mederma may help heal and decrease the appearance of scars. The product is designed to be easy and convenient to use but is only effective with consistent use over time. In addition to the added fragrance and purified water, Mederma has six ingredients.


PEG-4 is a form of polyethylene glycol and has been reviewed by the cosmetic ingredient review (CIR) panel as safe for cosmetic purposes. It is therefore allowed in personal care products. It works by slowing the loss of moisture, which means the formula will take longer to dry out and your container of Mederma will remain usable for a longer period of time.

Allium Cepa Bulb Extract

Allium cepa, the garden variety onion, is used as a skin conditioning agent. It will soften and help heal the skin, adding a supple tone to it. Onion extract is used in many scar treatments to help soften and fade scar appearance. This is the primary active ingredient in Mederma.

Xanthan Gum

Xanthan gum is a comes from corn sugar fermentation. It dissolves in water and can be used as a binder in products to hold different compounds together. It is also a surfactant, which decreases the product’s surface tension, making it easier to spread on your skin.


Allantoin is added to many personal care products because of its function as a skin protectant and conditioner. Skin protectants keep harmful toxins out of your skin and soothe it from irritants. Skin conditioners help heal skin, keeping it healthy and moisturized to prevent it from flaking. The Food and Drug Administration has approved it for over-the-counter usage in concentrations of 0.5 through 2 percent.


Methylparaben is a popular preservative that protects compounds from accumulating an overgrowth of mold, yeast and certain types of bacteria. It is added to lengthen Mederma’s usable lifespan.

Sorbic Acid

Sorbic acid is another preservative that kills microorganisms and helps the formula prevent the organisms’ growth and reproduction. It can come in either natural or synthetic forms. Sorbic acid works well against fungus and somewhat well against bacteria.