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Amino Acid Supplements

Amino Acids are the structural units that make up protein. Proteins are essential nutrients for the human body. They are the building blocks of the body and also serve as a fuel source. Amino acid supplements are increasing in popularity amongst athletes, bodybuilders and others on calorie-controlled diets.

All Amino Acid Supplements

Buy 5-HTP 100mg
5-HTP 100mg VV
9.4 / 10
505 reviews
from
£12.95
  • Naturally sourced - 99% pure 5-HTP
  • Top selling supplement
  • Well researched nutrient
  • Good alternative to St John's Wort
Buy L-Arginine 1000mg
L-Arginine 1000mg VV
9.4 / 10
238 reviews
from
£11.45
  • Very popular amongst sports people
  • Used by the body to make nitric oxide
  • Helps relax blood vessels
  • Acts as a powerful vasodilator
Buy L-Theanine 200mg
L-Theanine 200mg VV
9.6 / 10
165 reviews
from
£12.95
  • Pure, strong and high grade material
  • Found predominantly in tea
  • Not known to be addictive
  • Fully vegetarian capsule
Buy Marine Collagen 400mg
Marine Collagen 400mg P
9.6 / 10
128 reviews
from
£10.95
  • The finest marine-sourced collagen
  • Contributes to skin elasticity
  • A guaranteed Amino Acid profile
  • Hydrolysed for easier absorption
Buy High Strength L-Theanine 400mg
High Strength L-Theanine 400mg VV
9.4 / 10
58 reviews
from
£9.95
  • Double-strength capsules
  • Purest form available
  • Strongest form available in the UK
  • Increases brain alpha waves
Buy L-Lysine 500mg
L-Lysine 500mg VV
9.8 / 10
47 reviews
from
£7.49
  • Cannot be made by the body
  • An essential amino acid
Buy L-Carnitine 500mg
L-Carnitine 500mg V
9.4 / 10
12 reviews
from
£10.95
  • High quality Amino Acid
  • Energy release
  • Bioavailable N-Acetyl form
  • A popular sports supplement

Not sure which Amino Acid Supplements to choose? Read our latest customer reviews:

The views expressed below are the personal opinion of Just Vitamins customers. Just Vitamins does not endorse these views, nor should they be regarded as health claims or medical advice. All reviews are collected and verified as genuine by a 3rd party called Feefo.

Product Name
Posted
Rating
Comment
High Strength L-Theanine 400mg
11 Dec 2018
Service Rating: Prompt delivery
Product: Not sure if it is helping yet as I haven’t taken it for long enough
5-HTP 100mg
03 Dec 2018
Service Rating: Brilliant do the job
Product: Taking these for years def do the job for me
Marine Collagen 400mg
30 Nov 2018
Very prompt delivery. Good reliable service.
L-Lysine 500mg
29 Nov 2018
Service Rating: Excellent service, with good quality products and timely delivery.
Product: Taking 1000mg daily to prevent pesky cold sores which come at this time of year. Definitely seems to be working to date.
5-HTP 100mg
28 Nov 2018
Service Rating: Muito bom
Product: Rapidez e qualidade e segurança
Marine Collagen 400mg
27 Nov 2018
detailed, prompt, very clear website
High Strength L-Theanine 400mg
24 Nov 2018
Great as always
L-Theanine 200mg
23 Nov 2018
Service Rating: Everything was excellent.
Product: Good product, seems to work as well as any other.
L-Arginine 1000mg
23 Nov 2018
Fast delivery, always excellent service
5-HTP 100mg
21 Nov 2018
The package arrived very quickly. Thank you! I am very happy with the cooperation.
5-HTP 100mg
19 Nov 2018
Great good value
5-HTP 100mg
17 Nov 2018
Service Rating: Everything was as expected. The product is cheap and high-quality, and the delivery to Norway was really fast! 5/5 would order again
Product: I ordered 5-HTP and got 5-HTP. The capsules are quite basic, but that's just fine.
5-HTP 100mg
14 Nov 2018
Order came quickly
L-Theanine 200mg
14 Nov 2018
Superb
Marine Collagen 400mg
13 Nov 2018
Highly recommend. Great product and fast delivery!!!
5-HTP 100mg
11 Nov 2018
Good fast service at reasonable prices
L-Arginine 1000mg
06 Nov 2018
Great product for a good price and fast delivery. Thank you.
5-HTP 100mg
05 Nov 2018
Service Rating: Speedy delivery thank you and encapsulated product
Product: Still a lot of fillers and binders in this encapsulated product and they could not explain the addition of another additive. I find griffonia seed effective at helping me remain asleep to prevent 1.5 hourly awaking.
High Strength L-Theanine 400mg
04 Nov 2018
Prompt delivery as always. I’m very pleased to see 400mg L Theanine back in stock. I had to buy from a different company last time as only 200mg were available. I don’t want to have to take two capsules when I can take one so it’s good to be back with Just Vitamins!
5-HTP 100mg
29 Oct 2018
Service Rating: CAME ON TIME . ALLGOOD
Product: ALL GOOD BUT CAN NOT SIT HERE ALL DAY
We promise slick and speedy, same-day dispatch (Mon-Fri) on all orders received by 1pm!
Most of our products are delivered in super-slim pouches that slip neatly through your letterbox!

Free delivery throughout the UK

No minimum order needed - UK Standard delivery is free.

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