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Tag Archives: L-Isoleucine

  • Scivation Xtend vs BSN Amino X

    Amino acids are no longer a luxury supplement. If you look around the gym, most people will be drinking a brightly coloured powder that is more likely than not an amino acid-based supplement. The benefits of amino acids during your workout are numerous. When taken as directed, amino acids may be able to boost your recovery, trigger protein synthesis, and protect muscle from breakdown. Not every amino acid supplement is created equal. We reviewed two of the biggest amino acid supplement brands in the industry to determine which one was worth the buy.


    Scivation Xtend

    Where can I buy it?


    Pros of Scivation Xtend:

    Scivation Xtend gives you 7 grams of essential amino acids at a 2:1:1 ratio. That means you're getting the following breakdown:


    • L-Leucine 3,500mg
    • L-Isoleucine 1,750mg
    • L-Valine 1,750mg


    They even throw in 2,500mg of L-Glutamine, which is half the recommended dose but still a nice addition to a BCAA supplement. L-Glutamine may help to support fitness goals through enhanced recovery.


    The 2:1:1 ratio you have with Xtend is the ideal dose as demonstrated in multiple studies. Taken as directed, these amino acids may help to protect muscle mass, boost protein synthesis, and support recovery. (1-6)


    Last but not least, Xtend throws in Citrulline Malate, which may help to boost your energy on a ceullar level, thereby promoting fat burning.


    Cons of Scivation Xtend:

     There isn't much that could be considered a problem with Xtend. Sure, it has artificial flavours and colouring but so do 99% of the supplements out there. The only other potential issue is a lack of broad spectrum amino acids; however, keep in mind that Xtend specifically offers the essential amino acids. If you want a more broad spectrum amino acid supplement, you're better off taking a shot of protein.


    BSN Amino X

    Where can I buy it?


    Pros of BSN Amino X:

    BSN Amino X offers 10 grams of BCAAs per serving. That's 10 TOTAL grams of the following:


    • L-Leucine
    • L-Valine
    • L-Isoleucine
    • L-Alanine
    • Micronized Taurine
    • Micronized L-Citrulline


    As we mentioned above, those essential amino acids are going to play a helping role in boosting your ability to build muscle and protect current levels of muscle mass. They will also help with recovery, ensuring you can get back into the gym faster. The addition of Vitamin D makes Amino X a very competitive and forward-thinking supplement, especially when it comes to giving the muscles what they need to recover and grow.


    Cons of BSN Amino X:

    Our biggest issue with Amino X is that it is a proprietary blend. Sure, you're getting 10 grams of amino acids but you don't know the exact amount. This is important information as most studies are based on a very specific 2:1:1 ratio of the essential amino acids L-Leucine, L-Valine, and L-Isoleucine.

    With that said, seeing as how you're getting 10 grams worth of amino acids and the three most important ones are at the top of blend list, we would say it's safe to assume you're getting that ideal dosage.



    It's nearly impossible to choose between these two amazing brands. With price aside, if we had to pick one, we would go with Amino X from BSN.

    Sure, Amino X may use a proprietary blend but if you look at the amino acids listed, there is a really good chance that you're getting the ideal dosage. We also like the addition of the other aminos along with Vitamin D as this makes for a better recovery supplement.

    Again, Xtend from Scivation isn't a bad supplement. In fact, it's a terrific supplement. If you can, buy both and see which one you see the better results with.



    1. Tsutsumi R, Tsutsumi YM. Peptides and proteins in whey and their benefits for human health. Austin J Nutri Food Sci 2014;1(1): 1002
    1. Blomstrand E, Eliasson J, Karlsson HK, Köhnke R. Branched-chain amino acids activate key enzymes in protein synthesis after physical exercise. J Nutr. 2006 Jan;136(1 Suppl):269S-73S.
    1. Norton, Layne, Layman, Donald. Leucine Regulates Translation Initiation of Protein Synthesis in Skeletal Muscle after Exercise. J. Nutr. February 2006 vol. 136 no. 2 533S-537S.
    1. Negro M, Giardina S, Marzani B, Marzatico F. Branched-chain amino acid supplementation does not enhance athletic performance but affects muscle recovery and the immune system. J Sports Med Phys Fitness. 2008 Sep;48(3):347-51.
    1. Mourier A, Bigard AX, de Kerviler E, Roger B, Legrand H, Guezennec CY. Combined effects of caloric restriction and branched-chain amino acid supplementation on body composition and exercise performance in elite wrestlers. Int J Sports Med. 1997 Jan;18(1):47-55.
    1. De Lorenzo A, Petroni ML, Masala S, Melchiorri G, Pietrantuono M, Perriello G, Andreoli A. Effect of acute and chronic branched-chain amino acids on energy metabolism and muscle performance. Diabetes Nutr Metab. 2003 Oct-Dec;16(5-6):291-7.
  • Product Review: Scivation Xtend

    If you're like most supplement advocates out there, you have a tub or two of BCAAs (Branched Chain Amino Acids) on your shelf. BCAAs have become one of the most popular supplements to pick up because of a series of studies demonstrating the numerous benefits of amino acid supplementation in regards to fitness goals. Studies suggest that using BCAAs as directed may be able to support recovery, boost lean muscle gains, and protect your from protein breakdown.


    One of the most popular BCAA supplements on the market, Scivation Xtend, promises to be able to do that and much more. Let's take a look to see if this BCAA supplement can deliver on its promises.




    The first thing we noticed about Xtend from Scivation is the fact that it has a higher dosage of BCAAs when compared to most brands. It is still offering you a 2:1:1 ratio BUT the dosage itself is higher. In every serving of Scivation Xtend, you'll be getting the following dosage of essential amino acids that may help you achieve your muscle building and weight loss goals:


    • L-Leucine 5 grams
    • L-Isoleucine 75 grams
    • L-Valine 75 grams


    They also throw in L-Glutamine at 2.5 grams, which we feel is an excellent addition to a BCAA supplement as Glutamine is the most abundant amino acid found in muscle tissue. It's also used up the fastest during exercise so it's important to supplement with it.


    Two other additions that are impressive for a BCAA supplement are Vitamin B6 and Citrulline Malate. Both of these ingredients may be able to support your recovery while encouraging muscle development.


    As a whole, these ingredients working together may be able to trigger a higher level of protein synthesis to support recovery and muscle building. (1-3)




    For those of you looking to avoid artificial additives, you'll be hard pressed to do so with Scivation Xtend. It contains artificial flavouring as well as artificial sweeteners including sucralose and acesulfame potassium, more commonly called Ace-K. With that said, we've seen supplements with much worse in it. In comparison, it's not too bad.


    Outside of artificial additives, it is nearly impossible to find anything else that's wrong with this BCAA supplement. Given the well-designed formula, it's easy to see why this is a fan favourite. I suppose if you really are looking for a bone to pick with the supplement, perhaps you won't agree with one of the many flavours it offers.




    If you are going to buy a BCAA supplement, which you absolutely need to if your goals include muscle building or fasting, then Xtend from Scivation is a perfect choice. It gives you a properly dosed formula of essential amino acids as well as several additions that only make the product that much better. Artificial flavouring aside, you are going to love this BCAA supplement.


    Click here to buy Scivation Xtend.




    1. Pasiakos SM, Cao JJ, Margolis LM, Sauter ER, Whigham LD, McClung JP, Rood JC, Carbone JW, Combs GF Jr, Young AJ. Effects of high-protein diets on fat-free mass and muscle protein synthesis following weight loss: a randomized controlled trial. FASEB J. 2013 Sep;27(9):3837-47. doi: 10.1096/fj.13-230227. Epub 2013 Jun 5.


    1. Symes EK, Bender DA, Bowden JF, Coulson WF. Increased target tissue uptake of, and sensitivity to, testosterone in the vitamin B6 deficient rat. J Steroid Biochem. 1984 May;20(5):1089-93.


    1. D Bendahan, J P Mattei, B Ghattas, S Confort-Gouny, M E Le Guern, P J Cozzone. Citrulline/malate promotes aerobic energy production in human exercising muscle. Br J Sports Med 2002;36:282-289 doi:10.1136/bjsm.36.4.282.
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