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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

SAVE
5%
Buy 5-HTP 100mg
5-HTP 100mg V
9.4 / 10
434 reviews
from £11.95
£11.35
  • Naturally sourced - 99% pure 5-HTP
  • Top selling supplement
  • Well researched nutrient
  • Good alternative to St John's Wort
SAVE
10%
Buy L-Arginine 1000mg
L-Arginine 1000mg V
9.4 / 10
196 reviews
from £10.95
£9.86
  • 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 V
9.4 / 10
143 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
106 reviews
from
£10.95
  • The finest marine-sourced collagen
  • Contributes to skin elasticity
  • A guaranteed Amino Acid profile
  • Hydrolysed for easier absorption
Buy L-Lysine 500mg
L-Lysine 500mg V
9.6 / 10
37 reviews
from
£7.49
  • Cannot be made by the body
  • An essential amino acid
SAVE
50%
Buy L-Glutamine 500mg
L-Glutamine 500mg V
9.0 / 10
15 reviews
from £7.95
£3.98
  • Can assist tissue repair and growth
  • Easy to swallow capsule
  • A convenient amino acid source
Buy Branch Chain Amino Acid (BCAA)
BCAA 1000mg V
8.8 / 10
8 reviews
from
£10.95
  • Contains three key amino acids
  • In the important 2:1:1 ratio
  • Convenient tablet form
  • Contributes to growth in muscle mass
Buy L-Carnitine 500mg
L-Carnitine 500mg V
9.2 / 10
10 reviews
from
£10.95
  • High quality Amino Acid
  • Energy release
  • Bioavailable N-Acetyl form
  • A popular sports supplement
Buy L-Carnitine 1000mg
L-Carnitine 1000mg V
10.0 / 10
8 reviews
from
£9.95
  • High strength 1000mg tablet
  • A popular sports supplement
  • Aids in metabolising food into energy
  • Bioavailable N-Acetyl form
SAVE
10%
Buy High Strength L-Theanine 400mg
High Strength L-Theanine 400mg V
9.6 / 10
19 reviews
from £9.95
£8.96
  • Double-strength capsules
  • Purest form available
  • Strongest form available in the UK
  • Increases brain alpha waves

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
L-Arginine 1000mg
19 Jul 2017
Service Rating: The cost of the products purchased was considered most reasonable and although I live in Spain I received the parcel within eight days.

I am not over keen of the sealed packets and would prefer a container with a better seal.
Product: I feel that my circulation has improved in my legs, but I think I need a little longer to give a full evaluation. In my experience it is best not to give a final rating until one has been taking that particular supplement for an extended period.
5-HTP 100mg
16 Jul 2017
Service Rating: Very quick delivery in my mailbox every time and a very good price
Product: Good product at a goid price
5-HTP 100mg
15 Jul 2017
Potent product
L-Arginine 1000mg
14 Jul 2017
Service Rating: Very fast delivery...goog product!
Product: Very good vitamins...fast delivery!
L-Glutamine 500mg
11 Jul 2017
Service Rating: Very good service product was spot on and price was very good
Product: Good price and arrived very quickly
5-HTP 100mg
09 Jul 2017
Arrived quick, sensible package for posting. Would definitely order again.
5-HTP 100mg
08 Jul 2017
Service Rating: Quick delivery, good valve , recommended to any one ,
Product: Execellent , really work for me , good valvefor money
High Strength L-Theanine 400mg
06 Jul 2017
I ordered L-Theanine from Just Vitamins which are recommended for helping to reduce the symptoms of stress. I found the website easy to navigate and the capsules arrived promptly. I feel the capsules are definitely helping and will be re-ordering when I need more. Thank you.
5-HTP 100mg
06 Jul 2017
Service Rating: Fast delivery
Great product
My one and only health supplements shop
Product: Excellent
The very best actually
Marine Collagen 400mg
02 Jul 2017
I am very happy with my purchases from just vitamins, very quick delivery, very reasonably priced goods, and yes I would recommend Just Vitamins to my friends and relatives.
L-Theanine 200mg
02 Jul 2017
Quick accurate efficient delivery
L-Arginine 1000mg
01 Jul 2017
Service Rating: thanks
Product: Good stuff , they are working just fine if you take in my case only 1 per day.
L-Arginine 1000mg
29 Jun 2017
Service Rating: Everything ok, I would recommend them for the quality of the products and for the speed of the delivery
Product: very useful for the decline of the blood pressure and for excersice. I take 4 pills for my train and I see results
High Strength L-Theanine 400mg
29 Jun 2017
Service Rating: Good.
Product: Its not effective. I was getting more benefit from green tea.
Feedback Response: Hi,
Sorry you feel this supplement is not effective for you yet, but please persevere - it may take up to 3 months for you to recognise the benefits.
Kind regards,
Just Vitamins Customer Team
L-Theanine 200mg
25 Jun 2017
Service Rating: delivery was fine. not too slow either.
Product: treatment of negative symptoms of schizophrenia at 400mg. people now call me a savant!
L-Arginine 1000mg
24 Jun 2017
yes, it took three weeks for them to arrive.
L-Arginine 1000mg
22 Jun 2017
I'm 83, and many websites tend to pester and advertise afterwards. I'm not used to that. I went to you for Lutein in the first instance, and have decided to stay with you as long as you continue to be helpful but not pushy. (John)
Marine Collagen 400mg
20 Jun 2017
Service Rating: Items arrived quickly with clear information
Product: I have bought and used collagen supplements for a couple of years. These are well packaged with very clear information and don't need to be taken with food which I find helpful. Not too big although you do have to take 3 a day. So far very pleased and happy with results.
Marine Collagen 400mg
18 Jun 2017
Service Rating: Arrived well within the specified time, well packed, highly recommended.
Product: I don't know if it is working yet, it will take some time.
High Strength L-Theanine 400mg
13 Jun 2017
Glad to be able to get hold of L-Theanine for supplementary treatment of epilepsy.
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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