Eccrine glands are the most numerous, harbored in places like the forehead, hands, and feet. These glands are activated at birth and do not secrete proteins or fatty acids.
Apocrine glands, on the other hand, do secrete proteins and fatty acids and are found in the genital area and armpits. These become active during puberty and usually end in hair follicles.
The sweat coming from both types of glands does not have an odor. Body odor comes from bacteria living on the skin. The bacteria metabolize the proteins and fatty acids secreted from the eccrine glands, ultimately producing an odor. That odor can be influenced by the type of bacteria living on the skin and the kind of food a person eats.
This often unpleasant odor is the reason why deodorants and antiperspirants have become a popular body care product today. Many people have their favorite brand but are unaware that many antiperspirants are actually drugs that change the physiology of the body. These antiperspirants contain an active ingredient that is scientifically validated to accelerate brain aging and cause Alzheimer's disease. This drug is often rubbed into the sweat glands and taken up into the body.
Deodorants versus antiperspirants
Deodorants work by killing the bacteria that live on the skin. They are often scented to provide consumers with a pleasant fragrance. Commercial deodorants often contain hormone-disrupting chemical fragrances that absorb into the skin and disrupt the endocrine system. Natural deodorants use plant-based essential oils as an alternative to the chemicals. Many of these essentials oils give the natural deodorant more power, because they possess antibacterial properties that help drive away the bacteria in the sweat glands that cause the actual stink.
Antiperspirants, on the other hand, work in a much different way. Antiperspirants work by blocking the sweat glands, stopping the secretion of proteins and fatty acids. Most antiperspirants are made with aluminum salts like aluminum chloride, aluminum chlorohydrate or aluminum zirconium compounds. Since antiperspirants change the physiology of the body, they are actually considered an over-the-counter drug in the US and are regulated by the Food and Drug Administration. Every antiperspirant sold in the US has a Drug Identification Number (DIN), denoted on the label.
Chronic aluminum exposure and neurotoxicity
In 1986, aluminum was first recognized as a neurotoxin in the USA. The US EPA has established a safe range for aluminum salts in public drinking water, which is 0.05 to 0.2 milligrams per liter.
In a 2010 publication of Neurotoxicology, researchers from the Department of Medicine at the University of California showed how extended exposure to aluminum salts causes neurotoxicity. In an animal model, aluminum was given at low levels to determine acceleration of brain aging. They found out that aluminum salts can increase levels of glial activation, inflammatory cytokines and amyloid precursor proteins within the brain. These increases are all indicative of accelerated brain aging. The aluminum salts effectively increased brain inflammation that is also present in Alzheimer's patients.
Remarkably, aluminum salts like aluminum zirconium are marketed as the active ingredient in many commercial antiperspirants. Aluminum zirconium makes up 15 percent or more of most commercial antiperspirants! The label often warn consumers that the product can cause kidney damage too. Here's an example antiperspirant label here.