Close

We use cookies to help improve your experience of our website and cookies have already been set. To find out more or for advice on removing these cookies, read our Privacy and Cookies Policy.

By closing this message or continuing to use our website, you consent to our use of cookies in accordance with our Cookies Policy.

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
427 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
185 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
140 reviews
from
£12.95
  • Pure, strong and high grade material
  • Found predominantly in tea
  • Not known to be addictive
  • Fully vegetarian capsule
Buy Collagen (Marine) 400mg
Collagen (Marine) 400mg P
9.6 / 10
102 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
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
SAVE
50%
Buy L-Glutamine 500mg
L-Glutamine 500mg V
9.0 / 10
12 reviews
from £7.95
£3.98
  • Can assist tissue repair and growth
  • Easy to swallow capsule
  • A convenient amino acid source
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
7 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
10.0 / 10
14 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-Lysine 500mg
26 May 2017
Service Rating: Received in good time and I like the minimalist packaging but which also details everything about the contents and the dosage, which is not the case with many providers! Also like the clear base to your pack which allows inspection.
Freephone also much appreciated, so no hidden costs.
Product: I presume the vitamins are good quality, but will have to wait and see...!
5-HTP 100mg
25 May 2017
Service Rating: Snabb och bra leverans och tydlig hemsida. Frakten var billig och bra
Product: De gav mig ett bättre mående och kostade en tredjedel så mycket som Svenska
L-Arginine 1000mg
25 May 2017
Service Rating: Great, product and quick delivery, will definitely use again.
Product: Great Product, quick delivery, would use again.
L-Arginine 1000mg
17 May 2017
Service Rating: Easy transaction, fast delivery well packed and as described.
Product: A very good and quality product.
L-Arginine 1000mg
17 May 2017
Service Rating: Exceptional service. Will use again.
Product: Good packaging idea well protected in postage
5-HTP 100mg
13 May 2017
Bra 5htp.
5-HTP 100mg
11 May 2017
Excellent as always. High quality products and fast delivery. Cheaper than the competition too. Not much more needs to be said!
L-Arginine 1000mg
11 May 2017
Quick shipping nice packaging and reasonably priced.
L-Arginine 1000mg
10 May 2017
Very quick delivery to an East European address. Excellent service, will ceratinly be using them again.
L-Arginine 1000mg
08 May 2017
Service Rating: price was great and quality excellent.
have since been looking for vegan specific multi-vitamins, but to no avail.
Product: vegan friendly, excellent value for money
Collagen (Marine) 400mg
06 May 2017
Will buy them again
Collagen (Marine) 400mg
27 Apr 2017
The service was quick, but unfortunately I can't say anything about the vitamins because I have not taken enough to see results. Thank you.
5-HTP 100mg
26 Apr 2017
Service Rating: Excellent
Product: Excellent. Very good service
5-HTP 100mg
22 Apr 2017
Arrived really quick ,good value for money
L-Arginine 1000mg
22 Apr 2017
Service Rating: Easy to navigate through their web page and super quick delivery.
Product: First time I've taken any supplements, other than the usual Multi-vitamins. After a week of taking these, I can feel some benefit, although I would guess these need to be taken long term, with the occasional rest day to achieve the improved benefits of taking L-Arginine.
L-Arginine 1000mg
15 Apr 2017
Service Rating: Really quick delivery and items as described
Product: Reasonable sized capsules, not taken enough yet to notice a difference but hopefully will
5-HTP 100mg
14 Apr 2017
Service Rating: Snabb bra butik
Product: Have not discover any sleepy reaction from them
5-HTP 100mg
12 Apr 2017
Qualité rapidité prix
L-Carnitine 1000mg
09 Apr 2017
Service Rating: Simple to use web site and quick delivery
Product: These seem to doing their thing after about two weeks, they do seem to work, I'm taking two a day
L-Arginine 1000mg
08 Apr 2017
Service Rating: As usual competitive prices delivered prom[tly
Product: Good product for circulation problems
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.

Sign-up for offers by email

Just Vitamins sends out monthly offers by email.
Payments by
PayPal, Google Checkout and all Major Credit/Debit Cards Accepted.
 
MHRA Approved
This site is protected by Trustwave's Trusted Commerce program
©2017 Just Vitamins Ltd,
Wolfe Road, Coventry, CV4 9UP, UK
UK Reg No. 3991727
Ecommerce By Zarr
Design By Amathias
Top