It's not uncommon to notice spots on your fingernails. They are called leukonychia, and they appear as small white spots or streaks on your nails. If you've been sick or haven't been eating well and you develop spots on your fingernails, you might wonder if they're caused by a vitamin deficiency.

Type 2 diabetics are typically given metformin to help manage their blood sugar levels. Metformin is typically taken with a meal unless your doctor instructs you otherwise. Adverse effects include muscle pain, numbness of your extremities, difficulty breathing and stomach upset.

Glutamine is one of 20 amino acids that help form all internal proteins and perform various other jobs inside your body. Gamma aminobutyric acid, or GABA, is a type of chemical called a neurotransmitter that plays a prominent role in information transfer between the cells of your nervous system.

Prawns are a shrimp-like shellfish in the biological group of marine animals known as the decapods. Despite some anatomical differences between true shrimp and prawns, these closely related creatures are nearly identical from a nutritional perspective, due to similar feeding habits and body composition.

Selective serotonin reuptake inhibitors, or SSRIs, increase the brain’s levels of the mood-enhancing neurotransmitter serotonin. L-tryptophan is an essential amino acid that forms the starting point for serotonin synthesis.

Although your body absorbs about 30 percent of the calcium from the foods and beverages you consume, the amount can vary. Other factors affect the rate of absorption as well as the amount of calcium the body excretes in sweat, urine and feces.

Apple cider vinegar may be a common household item but it's also used in numerous home remedies. Only limited research has been conducted on the benefits of apple cider vinegar and even fewer on vinegar pills.

Selective serotonin reuptake inhibitors, or SSRIs, are a class of antidepressant drugs that historically succeeded the older antidepressants tricyclics and MAO inhibitors. Unlike the older antidepressants, SSRIs target the mood-enhancing neurotransmitter serotonin specifically. Some individuals do not respond to SSRIs.

The adrenal gland secretes DHEA, dehydroepiandrosterone, into the body. DHEA is a steroid precursor to sex hormones, androgen and estrogen. DHEA supplementation heightens sexual drive and energy, increases muscle growth and induces weight loss, according to MedlinePlus.

Diabetics who poorly manage their disease might develop a life-threatening condition called diabetic ketoacidosis, which is characterized by nausea or vomiting, dry mouth, fruity breath, deep rapid breathing and abdominal pain. Diabetic ketoacidosis occurs when fat and protein is used as the body’s main energy source.

If you experience bad dreams or nightmares frequently, there are some herbal supplements that you will want to avoid. Nightmares are a universal experience and account for up to 70 percent of all dreams in adults.

Beta-carotene is a precursor to vitamin A, which means that your body is able to use it to synthesize retinol if your liver has storage space for it. If your body contains enough vitamin A as retinol, beta-carotene is not converted.