Using Preservatives to Extend the Shelf Life of Your Products
EDITORIAL NOTE: THE FOLLOWING CREDIT MUST APPEAR UNDERNEATH THE TITLE OF THE ARTICLE
This article is copyright ©2004-2021 by Natural Sourcing, LLC (www.fromnaturewithlove.com) and is reprinted with permission.
Commercial products are typically loaded with preservatives to allow them to remain fresh during the long span between the time of manufacture and the time the customer finishes using it. Although the preservatives do extend the longevity of the products and help keep them free from bacteria, the preservatives themselves are often unhealthy. Many cause or promote skin problems and some are even reported to cause cancer. Individuals who are sensitive to these preservatives need to find preservative-free products.
Are there any natural preservatives? Not really. Natural substances that show antimicrobial activity are either not adequate for broad spectrum protection or they have undesirable qualities. Most natural substances are not active against the most threatening microbes, pseudomonads. Others, such as essential oils, require very high concentrations to be effective. Some have offensive odors or colors that would be unacceptable in skin care products. Many become inactivated by manufacturing procedures and other factors. So a natural preservative is not really an option.
One of the many advantages to handcrafting your own natural products is that you can eliminate or minimize the use of harmful preservatives. Instead, you can adapt more natural methods of preserving and/or using your products.
It's important to remember that your preservative-free, natural products will not stay fresh for as long as commercial products do. By making your products in small batches that you use up within a short period of time, your products will stay fresh and you eliminate the need to preserve your products with harsh chemical preservatives. Formulating anhydrous products is another way to eliminate the need for chemical antimicrobial preservatives. Bar soaps typically do not require an antimicrobial but stay fresher when an antioxidant is used. You do have natural antioxidants available to you for this purpose. Switch to the use of natural balms made of oil and butter instead of creams and lotions which require an antimicrobial preservative. Create dry bath products such as bath salts, milk baths, bath bombs, bath teas etc. to eliminate the need for antimicrobial preservatives. Salt scrubs, bath oils, bath melts and other oil based products can stay fresh as long as water is not introduced to the container during use. Again, you may wish to use a natural antioxidant to keep the oils fresh. Minimize contamination potential by choosing your packaging carefully. Dispensing bottles are better than open mouth jars.
Direct sunlight and UV rays, oxygen, heat, moisture and bacteria from your fingers can all be detrimental to your products. Below are several tips for protecting and preserving your preservative free formulations:
If you are formulating something that contains water, milk, hydrosols or other aqueous liquids, you will have to preserve the product or use it within 3-4 days refrigerated. It simply is not optional. Water provides a medium for harmful bacteria, mold, yeast and fungi to grow over time. If used, a contaminated product could cause severe health problems, blindness and even death. Your product must be adequately preserved to prevent contamination and microbial growth.
So what are your options and how will your product differ from those found on store shelves?
Your options will be based on your formulation and what it contains. Essential oils are the most natural antimicrobials you will find. Some natural product manufacturers have successfully used oils such as tea tree or combinations of various essential oils to maintain product integrity. According to Preservatives for Cosmetics by David C. Steinberg, essential oils that have demonstrated antimicrobial activity include caraway, cinnamon, clove, cumin, eucalyptus, lavender, lemon, rose, rosemary, sage, sandalwood and thyme. Unfortunately, the percentage required to adequately protect a product from microbial growth generally exceeds the recommendations for safe amounts of essential oils to use in skin care products. Grapefruit seed extract or citricidals are another class of antimicrobials that are considered by some to be more natural than the parabens. Choose your citricidal preservative carefully as some of them have questionable ingredients. A good quality citrus seed extract should not contain additional preservatives. Parabens are preservatives that are available in small quantities for crafters and small businesses. Paraben based preservatives include Germaben, Germaben II, Phenonip, Methyparaben and other types such as Germall and LiquaPar Oil.
An anti-oxidant is a preservative that reduces the rate of oxidation in oils that oxidize quickly. Oxidation is a chemical process that occurs when oils or other natural ingredients are exposed to oxygen. Anti-oxidants extend the shelf life of your products by reducing the rate of oxidation of your oils. Use an antioxidant in any formulation which contains fragile oils such as sweet almond, hemp, avocado, flax or evening primrose. You can add antioxidants directly to your oils to help keep them fresh, or you can add the antioxidant to the oil phase of your recipe. Lip balms, lotion bars, creams, lotions, scrubs and any other product containing oils can benefit from the addition of an antioxidant.
Vitamin E contains natural antioxidants which extend the life of your products. Gamma tocopherol, a component of Vitamin E, is a great antioxidant for protecting cosmetic formulations. T-50 has a larger amount of gamma tocopherols than other forms of Vitamin E oilWhile the alpha tocopherol in the 250, 1000, and 1400IU/g oils is wonderful as an in vitro antioxidant, studies show that the gamma tocopherol in the Vitamin E T-50 oil is a better antioxidant for oils/lipids in cosmetic formulations. T-50 has a higher content of gamma tocopherols and can be used at a rate of .05% or 400ppm to adequately protect your oils.
INCI Nomenclature: Tocopherols
Rosemary oil extract (ROE) also acts as a natural antioxidant. ROE can impart its own aroma into your products, so keep that in mind when using it. As a preservative, add .15 to .5 % of our undiluted Rosemary oil extract to your products.
Our Rosemary oil extract is a 100% pure extract. It has not been diluted in a vegetable oil.
INCI Nomenclature: Rosmarinus Officinalis (Rosemary) Leaf Extract
An anti-microbial is an ingredient or substance that helps to destroy unwanted micro-organisms such as bacteria. In the context of handmade skin care products, an anti-microbial helps preserve a product by keeping the product free of these unwanted micro-organisms.
Grapefruit Seed Extract (GSE) is a citrus seed based anti-microbial used as a preservative in skin care products. GSE is made with the extracts of citrus seeds and pulp. It is blended with vegetable glycerin to make it non-irritating to the skin and mucous membranes when used in formulations. GSE is even safe enough to use as a disinfectant for drinking water when necessary.
The GSE that is frequently available consists of 33% extract diluted in 66% glycerin. From Nature With Love, however, supplies a professional grade GSE that consists of 60% GSE diluted in 40% glycerin. Please be sure to keep the strength of the GSE in mind when using a recipe that simply calls for "GSE". GSE has a shelf life of 7-9 years. It is said to be anti-microbial, anti-septic, anti-bacterial, astringent and does also have some antioxidant activity.
Use GSE at .5 to 1% (professional strength GSE) to preserve most formulations, or use at 2% (professional strength GSE) to create anti-bacterial creams, salves, rinses and soaps. Please note that adding 2% GSE to your products does not mean that you can market or label the product as an "anti-bacterial" product.
Wear gloves while handling Grapefruit Seed Extract. GSE can be irritating to the skin in its undiluted form.
INCI Nomenclature: Grapefruit (Citrus Grandis) Extract (and) Glycerin
Germaben II is a convenient, ready-to-use broad spectrum anti-microbial preservative for personal care products such as shampoos, conditioners, lotions, creams, body sprays and other formulations. It is highly effective against gram positive and gram negative bacteria, yeasts and molds and does not need any additional preservatives. It is a clear, viscous liquid with mild odor. It is soluble in both oil/water emulsions and aqueous formulations up to a level of 1.0%. At 1%, Germaben II provides 0.30% Germall II, 0.11% methylparaben, 0.03% propylparaben, and 0.56% propylene glycol. Germaben II should be added slowly to your product under gentle agitation before the addition of fragrance oil.
Recommended usage rates are provided only as guidelines for proper preservation. All new formulations should be challenge tested to ensure preservative efficacy.
INCI Nomenclature: Propylene Glycol (and) Diazolidinyl Urea (and) Methylparaben (and) Propylparaben
Germaben II-E was developed to protect formulations that contain ingredients that inactivate parabens. It is a liquid preservative system that contains 20% Germall II, 10% methylparaben, 10% propylparaben, and 60% propylene glycol. It is used to preserve water-in-oil and oil-in-water emulsions but should not be used in aqueous formulations. It is readily soluble at 1.0% and should be added to the emulsified product under gentle agitation before the addition of fragrance. Germaben II-E is a complete preservative effective against gram positive and gram negative bacteria, yeasts and molds. It is compatible with almost all cosmetic ingredients including surfactants and proteins.
Recommended usage rates are provided only as a guideline for proper preservation. All new formulations should be challenge tested to ensure preservative efficacy.
INCI Nomenclature: Propylene Glycol (and) Diazolidinyl Urea (and) Methylparaben (and) Propylparaben
Liquid Germall Plus is a broad spectrum, water soluble preservative for oil-in-water and water-in-oil emulsions and water soluble formulations. It is highly effective against gram positive and gram negative bacteria, yeasts, molds and commonly found organisms. It is compatible with most cosmetic ingredients and has no known inactivators. Liquid Germall Plus is effective at low concentrations of 0.1 - 0.5% (the higher % should be used in conjunction with high protein and complex formulations). It remains active through a pH range of 3-8. It should be added during the water phase or to the emulsified portion of the formulation at a temperpature of 120F or less. Liquid Germall Plus has a safe toxicology profile and has been evaluated as safe for both rinse-off and leave-on formulations. It is a good choice preservative for shampoos, conditioners, lotions, creams, body washes, body sprays and other such formulas.
Recommended usage levels are meant only as a guide for proper preservation of your product. All new formulations should be challenge tested to ensure that your preservative is working properly.
INCI Nomenclature: Propylene Glycol (and) Diazolidinyl Urea (and) Iodopropynyl Butylcarbamate
LiquaPar Oil is a clear, liquid blend of isopropyl, isobutyl and n-butyl esters of para hydroxybenzoic acid. It is a very stable and effective preservative against gram positive and gram negative bacteria, yeast and mold. LiquaPar Oil is readily incorporated into various types of formulations, including anhydrous products, without heating. It is a good choice for salt scrubs and bath oils where no water is present but may be inadvertently introduced to the container during regular use. The recommended usage rate is 0.3 - 0.6% however, in complex formulations, 0.1% Germall II may be required for adequate preservation.
Recommended usage rates are meant as guidelines only. All new formulations should be challenge tested to ensure proper preservation.
INCI Nomenclature: Isopropylparaben (and) Isobutylparaben (and) Butylparaben
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This article is copyright ©2004-2021 by Natural Sourcing, LLC and is reprinted with permission. This article may be reprinted provided that all credit information remains intact.