Moisturizer

Water can leave your skin. This can make it dry.

Cream helps your skin. It keeps the water inside. It can also pull water from the air. This helps your skin stay soft.

Some creams are like a thin coat. They stop water from escaping. Other creams are like a sponge. They soak up water.

There are many kinds of cream. Some are thin like lotion. Others are thick like grease.

People use these to feel good. They can also help skin that is itchy. Using cream helps you stay comfortable.

Water constantly leaves your skin. This is called transepidermal water loss. Your skin stays healthy by keeping water inside. It needs this water to stay soft. If skin gets too dry, it can become brittle.

Moisturizers help protect your skin. They use two main ways to work. The first way is with occlusives. These make a coating on your skin. This coating stops water from escaping. Ointments are very good at this. They are thicker than lotions or creams.

The second way uses humectants. These are parts that soak up water. They can pull water from the air. They can also pull water from deep inside your skin. Most products use both types together.

Many people use these products. They help with itchy skin or eczema. You can find them in sunscreens and soaps too. Some people use oils from plants like coconut or avocado.

Be careful with some products. Some creams use paraffin. This can catch fire easily. It is also wise not to use too much cream. Using it too much might cause skin irritation.

A moisturizer is a special product used to protect and soften your skin. These products are also called emollients. The word emollient comes from a Latin word that means to soften. Your skin naturally makes its own oil called sebum to stay healthy. This oil helps keep your skin from getting too dry or brittle. Without enough moisture, your skin might become rigid or hard. A moisturizer helps your skin stay comfortable and soft. It acts like a helper for your body's natural skin barrier.

Water is always moving in and out of your body. It leaves your skin through a process called transepidermal water loss. To stop this, moisturizers use two main types of ingredients. The first type is called occlusives. These create a waterproof coating on your skin to trap moisture inside. Ointments are very strong occlusives, while lotions are much lighter. The second type is called humectants. These are hydrophilic, which means they love water. They soak up moisture from the air or from deeper layers of your skin.

Many different things can be used to make these products. Some people use petrolatum, which is a very effective moisturizer. It can reduce water loss by 50% to 75% for several hours. Other ingredients include cocoa butter, shea butter, and oils from plants. Companies often use oils from coconut, avocado, or corn. These plant oils are called renewable sources. Scientists also use mineral oils and waxes because they do not spoil easily. These ingredients help make the products last a long time on the shelf.

People use moisturizers for many different reasons and in many places. They are used to treat skin conditions like eczema or psoriasis. You can find moisturizer in many everyday items. It is in sunscreens, shaving creams, and even disposable diapers. Some products are used as a base for medicine, like Whitfield's ointment. There are many famous brands you might see in a store. These include names like Vaseline, Nivea, CeraVe, and Aveeno. Each brand uses different mixes of ingredients to help the skin.

It is important to use these products the right way. Using too much moisturizer can sometimes cause skin irritation or allergies. Some products contain scents or food ingredients that might bother sensitive skin. The American Academy of Allergy, Asthma, and Immunology gave a warning in 2014 about this. They noted that natural ingredients like coconut milk could cause new allergies. Also, be careful with products containing paraffin. In the U.K., paraffin was linked to 50 fire incidents between 2010 and 2018. Always follow the safety labels on your skin creams.

A moisturizer, also known as an emollient, is a cosmetic preparation. Its primary purposes are to protect, moisturize, and lubricate the human skin. Healthy skin naturally produces a substance called sebum to perform these functions. The term emollient comes from the Latin verb *mollire*, which means to soften. By using these products, people can help maintain the skin's barrier. This barrier is vital for protecting the body against pathogens, dirt, and physical damage.

To understand how moisturizers work, we must look at how skin loses water. In the human body, water constantly evaporates from the deeper skin layers. This process is known as transepidermal water loss. Normally, skin loses about 4 to 8 grams of water per square meter every hour. The skin's ability to retain this moisture depends on the lipid bilayer. This is a layer of fats located between the dead skin cells. Moisturizers work by modifying the rate of this water loss through specific active ingredients.

Active ingredients in moisturizers generally fall into two categories: occlusives and humectants. Occlusives are hydrophobic, meaning they repel water. They form a coating on the surface of the skin to keep moisture from escaping. The level of occlusion depends on the product's consistency. Ointments are more occlusive than aqueous creams, which are more occlusive than lotions. For example, applying a layer of petrolatum can reduce water loss by 50% to 75% for several hours.

Humectants work differently because they are hydrophilic, which means they attract water. These ingredients absorb moisture from the humid air when humidity is above 70%. They can also draw water from the deeper layers of the skin up to the surface. Because this can reduce hydration in lower layers, humectants are often combined with occlusives. This combination ensures the skin stays hydrated both at the surface and underneath. Many moisturizers also contain water to act as a temporary hydration agent.

There are many different types of ingredients used in these formulations. Petrolatum is one of the most effective, though its oily texture is sometimes unpopular. Many products use mineral oils and waxes because they are not prone to oxidation or rancidity. This makes them more stable than vegetable oils. Recently, manufacturers have used more plant-based emollients from renewable sources. These include coconut oil, avocado oil, corn oil, and shea butter. These botanical esters can provide multiple functions, such as pigment wetting and lubrication.

Moisturizers serve many medical and practical purposes. They are used to treat skin diseases like psoriasis, ichthyosis vulgaris, and xerosis. They also help manage pruritus, which is itching, in atopic dermatitis. Many moisturizers act as vehicles, or bases, for topical medications like Whitfield's ointment. You can also find moisturizing agents in sunscreens, shaving creams, and even disposable diapers. While some products claim to reduce wrinkles, many such claims lack strong scientific evidence.

However, there are important safety considerations to keep in mind. Over-moisturization can occur if products are applied too frequently. This might allow foreign substances to penetrate the skin, causing contact dermatitis or infections. Additionally, aromas or food additives like coconut milk can trigger immune reactions. The American Academy of Allergy, Asthma, and Immunology warned in 2014 that natural ingredients could introduce new food allergies. Finally, paraffin-based products pose a fire risk. In the U.K., paraffin was linked to 50 fire incidents between 2010 and 2018, many of which were fatal.