• L-Theanine 100mg (SunTheanine)
  • L-Theanine 100mg (SunTheanine)
  • L-Theanine 100mg (SunTheanine)
  • L-Theanine 100mg (SunTheanine)
  • L-Theanine 100mg (SunTheanine)
  • L-Theanine 100mg (SunTheanine)

L-Theanine (SunTheanine®)

£ 14.25

£0.24 / capsule
(1) Reviews
100mg | 60 capsule

Mood-promoting effects that may help lower mental and physical stress


L-Theanine - May promote a calm and relaxed effect, support positive mood, and help improve mental focus and attention


Benefits of L-Theanine (SunTheanine®)
  • A pure form of L-Theanine
  • Boosts positive mood and helps decrease irritability
  • May help decrease anxiety, and promote relaxation (without drowsiness)
  • Supports brain health and may improve mental focus and attention
  • May lower mental and physical stress, and may also help with sleep disturbances
  • Can help sustain healthy blood pressure levels that are already within normal levels

The L-Theanine found in this product is SunTheanine®, a pure form of L-Theanine. Unlike other stress reducing and calming supplements, Suntheanine® doesn't cause drowsiness.

Theanine is an amino acid that has shown to increase serotonin levels in the brain. These brain chemicals are commonly known as ‘feel good’ neurotransmitters, and as such, they may help boost mood, decrease anxiety, and promote relaxation. L-Theanine may also support brain health by helping to improve focus and attention and boosting cognition.

Theanine is derived from herbal green tea and may have calming and mood-promoting effects that may effectively lower mental and physical stress, and may also help with sleep disturbances. It may enhance the activity of an enzyme that breaks down beta-amyloid protein - which has been associated with the development of Alzheimer’s disease.

Theanine helps sustain healthy blood pressure levels that are already within normal levels.

As with most amino acid supplements, your body generally needs vitamin B6 (pyridoxine) as a cofactor to help ensure correct amino acid metabolism.



As a dietary supplement, adults take one tablet, one to three times daily between meals or as directed by a health professional.

Store in a cool, dry place, away from direct light.

Do not exceed the recommended daily dose.

Keep out of reach of young children.

Children, pregnant women, and women who are breastfeeding should consult their doctor before use.

Nutritional supplements should not replace a varied and balanced diet and a healthy lifestyle.

Check with simultaneous intake of medicines with your physician or healthcare professional. No long-term use without professional advice.

L-Theanine 100mg - From SunTheanine®, a pure, patented source of L-Theanine.

Other Ingredients: Vegetarian capsules (cellulose, water), cellulose, magnesium stearate and silica.

Free from: Sugar, salt, dairy, yeast, wheat, gluten, soy, corn, preservatives, artificial colours and/or flavours


Nathan PJ, Lu K, Gray M, Oliver C. The neuropharmacology of L-theanine(N-ethyl-L-glutamine): a possible neuroprotective and cognitive enhancing agent. J Herb Pharmacother. 2006;6(2):21-30

Akiko Higashiyama, Hla Hla Htay, Makoto Ozekib, Lekh R. Juneja, Mahendra P. Kapoor. Effects of l-theanine on attention and reaction time response. Journal of Functional Foods. Volume 3, Issue 3, July 2011, Pages 171-178

Nobre AC, Rao A, Owen GN. L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pac J Clin Nutr. 2008;17 Suppl 1:167-8

Kakuda T. Neuroprotective effects of the green tea components theanine and catechins.cBiol Pharm Bull. 2002 Dec;25(12):1513-8

Kakuda T. Neuroprotective effects of theanine and its preventive effects on cognitive dysfunction. Pharmacol Res. 2011 Aug;64(2):162-8

Kimura K, Ozeki M, Juneja LR, Ohira H. L-Theanine reduces psychological and physiological stress responses. Biol Psychol. 2007 Jan;74(1):39-45

Kim TI, Lee YK, Park SG, Choi IS, Ban JO, Park HK, Nam SY, Yun YW, Han SB, Oh KW, Hong JT. Theanine, an amino acid in green tea, attenuates beta-amyloid-induced cognitive dysfunction and neurotoxicity: reduction in oxidative damage and inactivation of ERK/p38 kinase and NF-kappaB pathways. Free Radic Biol Med. 2009 Dec 1;47(11):1601-10

Mon 31st Jul 2017

Great product, saw really good reviews elsewhere so glad to be able to use it.

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