See below a list of the systems of the human body and the supplements that have an effect on them, based on scientific studies from the U.S. National Library of Medicine.

Cardiovascular System
Circulates blood around the body via the heart, arteries and veins, delivering oxygen and nutrients to cells and carrying waste products away.

Digestive System
System to absorb nutrients and remove waste via the gastrointestinal tract, including the mouth, esophagus, stomach and intestines.

Endocrine System
Small organs throughout the body, which produce hormones that influence the activity of cells by interacting with the nervous system.

Immune System
A set of cells, cell products, tissues, organs and processes that defend the body against pathogens that may endanger it.

Integumentary system
Skin, hair, nails, sweat and other glands that build a protective covering and provide UV protection and temperature regulation.

Muscular System
Enables the body to move using muscles and tendons. They control movement, posture and assist the body with heat generation.

Nervous System
Collects and processes information from the senses via nerves and the brain and tells the muscles to contract to cause physical actions.

Ocular System
It detects and interprets information from visible light to build a representation of the surrounding environment, using the eyes and optic nerves.

Overall Systems
More than one body system is affected.

Reproductive System
The sex organs for males and females that are required for the production of offspring and the continuation of life.

Respiratory System
Brings air into the lungs to absorb oxygen and transfer it to the bloodstream, and pushes air out of the lungs to produce carbon dioxide.

Skeletal System
The skeleton helps to keep the structure of the body and its organs. Its articulations allow a range of motion in the joints.

Urinary System
Uses the kidneys to filter the toxins carried in the blood and produce urine, and move this liquid through channels to store it in the bladder.

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