DIAAS (Digestible Indispensable Amino Acid Score) is the gold standard method for measuring protein quality, adopted by the FAO and WHO to replace the older PDCAAS system.

Unlike PDCAAS — which caps scores at 1.0 and measures crude protein digestion — DIAAS evaluates how well each individual essential amino acid is digested and absorbed at the ileal (small intestine) level. This gives a far more accurate picture of how much usable protein your body actually receives from a given source.

A DIAAS score above 1.0 indicates an excellent-quality protein. Radix Whey scores 1.61, which is exceptional — meaning gram for gram, it delivers significantly more digestible essential amino acids than most protein sources on the market. For anyone serious about muscle protein synthesis, recovery, or overall protein intake, DIAAS is the most reliable measure of protein quality available.

Radix Whey's exceptional DIAAS score of 1.61 comes from its unique multi-source whey complex sourced from NZ grass-fed cows via Fonterra NZMP.

The blend combines three complementary protein fractions: Ultrafiltered Whey Protein Isolate (WPI), Whey Protein Concentrate (WPC), and Milk Protein Concentrate (MPC). Each fraction contributes a distinct amino acid profile, and together they achieve a digestible indispensable amino acid density that no single source can match alone.

For context: a standard WPI scores 1.09–1.30, WPC80 scores 0.97–1.10, and soy protein scores just 0.91.

Radix's complex at 1.61 means every gram of protein delivers significantly more usable EAAs to support muscle protein synthesis.

Yes. Radix Whey is HASTA certified and WADA compliant, meaning it is tested for over 200 substances banned in sport. This provides assurance for competitive athletes at all levels.

The whey protein is sourced exclusively from Fonterra NZMP, New Zealand's largest dairy cooperative, using milk from free-range, grass-fed cows raised in New Zealand's natural pasture system. The product is free from gluten, soy, and artificial sweeteners, and is non-GMO.

With Radix Whey, you can be confident the product on the label is exactly what's in the tub — no contamination, no banned substances, no compromises.

Radix Whey contains a blend of Whey Protein Isolate (WPI), Whey Protein Concentrate (WPC), and Milk Protein Concentrate (MPC), so it does contain dairy and some lactose.

However, the Whey Protein Isolate fraction in the blend undergoes ultrafiltration, which removes a significant portion of lactose. Many people with mild lactose sensitivity find that WPI-dominant blends are easier to digest than standard WPC products.

If you have a diagnosed lactose intolerance or dairy allergy, we recommend consulting with your healthcare provider before use. For those with mild sensitivity, starting with a half serve to assess tolerance is a sensible approach.

Radix Whey is sourced exclusively from Fonterra NZMP, using milk from New Zealand grass-fed, free-range cows. There are several reasons NZ grass-fed whey is considered a premium protein source:

• Pasture-raised year-round — New Zealand's temperate climate allows cows to graze on natural pastures for the majority of the year, supporting a more natural diet.
• No added hormones — New Zealand dairy farming regulations prohibit the use of rBST (recombinant bovine growth hormone).
• Strict quality standards — Fonterra NZMP operates under some of the most rigorous food safety and quality systems in the world.
• Superior amino acid profile — The multi-source whey complex in Radix achieves a DIAAS score of 1.61, reflecting exceptional protein quality and digestibility.

For athletes and health-conscious consumers, NZ grass-fed whey offers confidence in both the quality and the sourcing of their protein.

Yes. Strom Sports NZ is NZ-owned and operated, shipping from Ruapehu, New Zealand. We offer fast tracked shipping across New Zealand and to Australia. All orders include tracking so you can follow your delivery every step of the way.