Rosacea is a skin condition that generally occurs on the face and is ongoing. It is characterized by on and off redness. If rosacea is not treated, you might experience a swollen nose, bumps, pimples and irritation in the eyes.

Arginine affects many different physiological processes. Taking arginine supplements improves your health, according to an March 2010 report in the "Journal of Cardiovascular Pharmacology and Therapeutics." Arginine-induced increases in human growth hormone, HGH, may mediate these effects.

Apple cider vinegar is a go-to ingredient in home remedies. It has been linked to treatments for high blood pressure, weight loss and arthritis. Though evidence is generally lacking to prove these effects, some natural health gurus -- including Thomas Baroody, author of "Alkalize or Die"

A deficiency of vitamin B12 in your diet can lead to digestive tract issues whose symptoms can include abdominal bloating and gas. Fortunately, it's possible to increase the amount of B12 you ingest through foods, supplements and prescribed injections to help alleviate the gas and bloating that a lack of B12 can cause.

Vitamin B-12 is just one of the many vitamins your body needs to stay healthy and function properly, and it plays an essential role in nerve and neurological function. If you're not getting enough of this important vitamin, your body will let you know, often through pain in the legs or other extremities.

Fertility, or the potential to reproduce, depends upon many factors, including the frequency and timing of sexual activity, age, nutrition, sperm quality and reproductive organ health.

Muscles in your eyelids control the movement of your lids, and if you have a spasm in one of these muscles, you might experience an eyelid twitch. If this occurs, you might feel your eyelid twitch uncontrollably, but observers cannot usually detect the twitch.

Probiotics are “friendly” bacteria found in foods such as yogurt, miso or kefir. They’re also available in supplements in the form of liquid, powder or capsules.

Arginine is a popular supplement that people take for such conditions as congestive heart failure, chest pain, bladder inflammation and erectile dysfunction. Arginine can cause blood vessels to relax and increase blood flow.

N-Acetylcysteine, or NAC, is an altered form of the amino acid cysteine used in supplements. The body converts NAC to cysteine, which is then converted to glutathione, an antioxidant. NAC is not found naturally in food sources; however cysteine is present in most high protein foods.

Iodine, or iodide, is a trace mineral found in ocean water, in ocean-dwelling plants and animals, and in soils adjacent to oceans. Iodine’s principal role in human metabolism is in the production of thyroid hormones.

Dystonia is a neurological movement disorder that causes involuntary muscle spasms and contractions.