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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
10%
Buy 5-HTP 100mg
5-HTP 100mg VV
9.4 / 10
482 reviews
from £12.95
£11.66
  • 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
224 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
SAVE
10%
Buy L-Theanine 200mg
L-Theanine 200mg VV
9.6 / 10
161 reviews
from £12.95
£11.66
  • 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
119 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 VV
9.6 / 10
46 reviews
from
£7.49
  • Cannot be made by the body
  • An essential amino acid
Buy High Strength L-Theanine 400mg
High Strength L-Theanine 400mg VV
9.6 / 10
42 reviews
from
£9.95
  • Double-strength capsules
  • Purest form available
  • Strongest form available in the UK
  • Increases brain alpha waves
Buy L-Carnitine 500mg
L-Carnitine 500mg V
9.2 / 10
11 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

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
5-HTP 100mg
19 Jun 2018
Service Rating: I liked their site, the prices are fair and they have a speedy and freindly service.
Product: I´ve used 5htp for my sleeping difficulties and I have for some time. This is the first time I have bought Just vitamins 5htp, Unfortunatly just vitamins 5htp simply does not work. Where as I get a good nights sleep with other brands I get no relief from the tablets provided by Just vitamins.
5-HTP 100mg
08 Jun 2018
Service Rating: dgsdbh
Product: gsdgsdegserghrthjtrhjtrjtrj
5-HTP 100mg
05 Jun 2018
Service Rating: Brilliant as always.
So easy to order items you have ordered before.
Post box friendly deliveries are fantastic.
Have recommended many many times
Product: Low in serotonin and these have really helped. Just start off slow and build up. Make sure you follow the instructions.... as always... don't take too many.
High Strength L-Theanine 400mg
04 Jun 2018
Service Rating: The vitamins are reasonably priced, the service prompt and efficient. I love how the vitamins are packaged as they can be posted through my letterbox.
Product: They definitely help with my sleep and lessen my anxiety
High Strength L-Theanine 400mg
03 Jun 2018
Service Rating: Easy to order, fair pricing and fast delivery.
Product: Calming effects - very good
5-HTP 100mg
30 May 2018
Service Rating: Supersnabb leverans! Ska fortsätta beställa av er i fortsättningen med!
Product: Lättsvalda kapslar med neutral smak.
L-Theanine 200mg
28 May 2018
Service Rating: Prompt.
Product: Effective alternative to prescription betablockers.
L-Theanine 200mg
27 May 2018
Nice and fast
L-Theanine 200mg
19 May 2018
Service Rating: Very good service each time I've used them.
Product: Very effective I use them regularly.
5-HTP 100mg
16 May 2018
Service Rating: Snabba leveranser bra produkter
Och bra prisnivå
Product: Snabb leverans hem i brevlådan
High Strength L-Theanine 400mg
16 May 2018
Service Rating: Great products, good price and fast delivery.
Product: Helps calm my mind, relax and focus.
5-HTP 100mg
15 May 2018
Service Rating: Just right. Quick delivery. Good value. Would order again.
Product: Great value for money and fast delivery.
L-Arginine 1000mg
10 May 2018
Quick reliable delivery and good product
L-Arginine 1000mg
10 May 2018
Service Rating: Fast Service
Product: Good fast Service again yet again
L-Arginine 1000mg
10 May 2018
Excellent
High Strength L-Theanine 400mg
04 May 2018
Service Rating: Because their vits are excellent quality and their service is very good too.
Product: high strength so I don't need to take twice daily so saving money
5-HTP 100mg
02 May 2018
Service Rating: Excellent service, excellent product
Product: Have taken this for a few years, excellent product
High Strength L-Theanine 400mg
30 Apr 2018
Service Rating: Would recommend they do just what they say very good
Product: The service is very good as is the product
L-Theanine 200mg
28 Apr 2018
Great products and speedy delivery.
High Strength L-Theanine 400mg
28 Apr 2018
Service Rating: Everything is high quality and well thought from product to delivery. I will use again. Thanks
Product: I cannot live without it now it makes a real difference.
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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