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L-Theanine

L-Theanine (also known as tyrosine, tryptophan and theanine) is a non-essential amino acid found in the human body. Non-essential means that the body can manufacture the L-Theanine it requires. Additional needs have to be met through the diet or by taking a suppplement. Food sources of this amino acid include good quality proteins like red meat, fish and dairy products. L-Theanine is also readily available in the form of a tablet or powder supplement.

It performs several functions including being converted to glucose for the body to use as an energy supply. It is also used by white blood cells and assists in the immune function of the body. Cells lining the intestine use L-Theanine as a source of fuel and without this amino acid they would simply waste away.

Why take L-Theanine?

  • To help strengthen the body's immune system
  • For gastro-intestinal disorders like Chron's Disease and Irritable Bowel Syndrome
  • For brain health and mood enhancement
  • To help with post workout recovery


What are the side effects of L-Theanine?

As it is a substance that occurs naturally in the body the side effects of L-Theanine are limited to bloating and constipation. Other side effects could include:

  • Accumulation of ammonia in the blood in patients with kidney disease
  • May increase seizures in people that are prone to them


If you are currently taking any prescribed medication or have any medical conditions please consult your doctor or consultant, to seek advice before taking any vitamins or supplements.