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Single amino acids in capsules and powders: glycine, L-theanine, glutamine, taurine, betaine (TMG) and acetyl L-carnitine. There are no authorised health claims for these, so each product page and guide tells you what the trials found, the dose they used and how long they ran, and leaves the decision with you.

Start with the guides: glycine and sleep, theanine for stress, glutamine and the gut, and what taurine does.

Made in the UK to GMP standards. If you are pregnant, breastfeeding or under the care of a GP for a long term condition, ask them first. Not sure which one? Ask Nutri365, the Nutri Tailor AI health expert, and Nutri365 will check your goals against what you already take.

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  • Acetyl L-carnitine only, no fillers
  • The form studied for brain and nerve
  • Vegetable capsule, suitable for vegans
Acetyl L-Carnitine Capsules

Acetyl L-Carnitine Capsules

  • Acetyl L-carnitine only, no fillers
  • The form studied for brain and nerve
  • Vegetable capsule, suitable for vegans
£31.46
45 day supply

0.00 per day

  • L-theanine only, no fillers
  • The compound that gives green tea its calm
  • Vegetable capsule, suitable for vegans
L-Theanine Capsules

L-Theanine Capsules

  • L-theanine only, no fillers
  • The compound that gives green tea its calm
  • Vegetable capsule, suitable for vegans
£26.40
30 day supply

0.00 per day

  • Pure glycine with no other active ingredients
  • A small dose that is easy to adjust
  • Vegetable capsule, vegan and free from gluten, dairy and nuts
Glycine Capsules

Glycine Capsules

  • Pure glycine with no other active ingredients
  • A small dose that is easy to adjust
  • Vegetable capsule, vegan and free from gluten, dairy and nuts
£30.00
100 day supply

0.00 per day

  • L-glutamine only, no fillers
  • Taken before meals
  • Vegetable capsule, suitable for vegans
L-Glutamine Capsules

L-Glutamine Capsules

  • L-glutamine only, no fillers
  • Taken before meals
  • Vegetable capsule, suitable for vegans
£23.28
16 day supply

0.00 per day

  • Helps maintain normal homocysteine levels
  • Betaine citrate, a well tolerated form
  • Vegetable capsule, suitable for vegans
Betaine TMG Capsules

Betaine TMG Capsules

  • Helps maintain normal homocysteine levels
  • Betaine citrate, a well tolerated form
  • Vegetable capsule, suitable for vegans
£24.13
90 day supply

0.00 per day

  • Taurine only, no fillers
  • One capsule a day with a meal
  • Vegetable capsule, suitable for vegans
Taurine Capsules

Taurine Capsules

  • Taurine only, no fillers
  • One capsule a day with a meal
  • Vegetable capsule, suitable for vegans
£21.46
60 day supply

0.00 per day