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Cardiovascular Research Ltd., Norival, 120 Capsules (Discontinued Item)

Cardiovascular Research Ltd., Norival, 120 Capsules (Discontinued Item)

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Out of Stock - Discontinued
  • Shipping Weight:
    0.24 lbs
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  • Product Code: CVR-20111
  • UPC Code: 999901201110
  • Package Quantity: 120 Capsules
  • Dimensions:
    2.3 x 2.3 x 4.2 in, 0.2 lbs
    Switch to Metric units
  • Please Note: This item has been discontinued and replaced by CVR-13066.

Product Overview


  • N-Acetyl-L-Tyrosine with Biopterine
  • Dietary Supplement

Norival is a scientifically-designed supplement containing a special form of the amino acid L-tyrosine in conjunction with the rare vitamin, Biopterin.

Suggested Use

Take one or two capsules daily, or as directed by a physician.

Other Ingredients

Cellulose, gelatin, magnesium stearate and silicon dioxide.

Supplement Facts
Serving Size: 1 Capsule
Servings per Container: 120
  Amount Per Serving %Daily Value*
Vitamin B6 (as pyridoxal-5-phosphate) 10 mg 500%
N-Acetyl L-Tyrosine 300 mg **
Biopterin 25 mcg **
* Percent Daily Values are Based on a 2000 Calorie Diet.
** Daily Value Not Established.
iHerb Customer Reviews

Did not experience benefits noted by others

Posted by Health-Is-Wealth on Oct 30, 2013 | Verified Purchase

Nice idea, but these don't work for me - P5P causes me to feel rubbish. I'd maybe get this again to try it if it contained non-P5P B6, non-acetyl tyrosine and biopterin - and if it didn't contain added stearate and sillycon. I recently tried Jarrows acetyl tyrosine with B6 - beneficial only for the small amount of B6, but I know that L tyrosine works. If this review was helpful to you, please click YES below - thank you. For reviews of all the products I have purchased from iHerb, please click my username above.

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There are better options if not looking for the rare Biopterin

Posted by Reviewer1733570 on Jun 07, 2013 | Verified Purchase

I get a nice awakening push from plain Tyrosine, however, far from improving mood I get irritable on this product.

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Great product.

Posted by Reviewer2213616 on May 14, 2013 | Verified Purchase

After being diagnosed with MTHFR, I am also depleted in tetrabiopterin which leaves a build up of phenylalanine. It helps me to focus and I also believe it assists with my thyroid hormones. I am restricted to casein and sulphur foods, that doesn't leave much high tyrosine products left. Yep, definitely recommended.

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Perfect for people with genetic problems

Posted by Reviewer3181965 on Oct 08, 2012 | Verified Purchase

I've just discovered I have a rare inborn error of metabolism that leads to low levels of tetrahydrobiopterin (BH4). I tried ordinary L-tyrosine and it worked. Norival actually includes biopterin (although doesn't state which form BH4 or BH2)and cofactor P5P, in addition to N-acetyl L-tyrosine (active form). A deficiency of an enzyme is felt in every cell, especially in the brain. Norival made my brain work properly, my temperature regulation improved amazingly! The dose must be individually adjusted. I take all such supplements 3x daily, in smaller doses, to keep the blood supply stable. I only wish I could contact the company, to learn which biopterin they use.

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Norival, 120 capsules

Posted by Reviewer2869683 on Oct 18, 2011 | Verified Purchase

This product works well with L-Methylfolate (5-MTHF). For those with homozygous MTHFR 677C-T mutation Norival and L-Methylfolate 10mg has helped my mental clarity, lethargy, moodiness, and depressive episodes. I am not on any antidepressants. Has also worked well for my teenage son with the same double MTHFR mutation.

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