Core Power protein shakes get their protein from ultra-filtered milk, not from added protein powders. The protein is a natural blend of about 80% casein and 20% whey, the same two proteins found in all cow’s milk, just concentrated through a filtration process that increases the protein content well beyond what regular milk provides.
How Ultra-Filtration Concentrates the Protein
Core Power is made by fairlife, which uses a membrane filtration technique to separate milk into its individual components. The milk passes through a semipermeable membrane that retains large molecules like proteins while allowing smaller molecules like lactose, water, and certain minerals to pass through. The result is milk with significantly more protein per serving and roughly half the sugar of regular milk.
This is different from most protein shakes on the shelf, which start with water and add whey protein isolate or concentrate as a powder. Core Power’s protein remains in its original liquid milk form, just filtered down to a more concentrated version. That distinction matters for texture and taste: the shake drinks more like thick chocolate milk than a chalky protein supplement.
Casein and Whey: What Each Does
The 80/20 casein-to-whey ratio in Core Power mirrors the natural ratio in cow’s milk. These two proteins behave differently in your body, and having both in one drink offers a practical advantage.
Whey is a fast-digesting protein. It spikes amino acid levels in your blood quickly, which is why it’s popular immediately after workouts. Casein digests much more slowly, forming a gel-like substance in your stomach that releases amino acids over several hours. Together, you get a quick initial hit of amino acids followed by a sustained supply, which supports muscle repair over a longer window than whey alone would.
How Much Protein Per Bottle
Core Power comes in two main lines. The standard version contains 26 grams of protein per bottle, while Core Power Elite packs 42 grams. Both use the same ultra-filtered milk base; the Elite version simply has a higher concentration.
For context, 26 grams is roughly equivalent to four eggs or a small chicken breast. The 42-gram Elite bottle delivers more protein than most people need in a single sitting for muscle synthesis purposes, but it’s a convenient option for larger athletes or anyone using it as a meal replacement.
Lactose, Sweeteners, and Other Ingredients
Core Power is lactose-free despite being a real milk product. Most of the lactose gets physically removed during ultrafiltration, and any remaining lactose is broken down by added lactase enzyme into simpler, digestible sugars. If you’re lactose intolerant, these shakes are generally well tolerated.
The ingredient list does include several sweeteners and thickeners beyond the filtered milk itself. The chocolate flavor, for example, uses monk fruit juice concentrate, stevia leaf extract, acesulfame potassium, and sucralose. That’s a mix of natural and artificial sweeteners working together to keep sugar low while maintaining sweetness. For texture, the shake relies on carrageenan, cellulose gel, and cellulose gum as stabilizers and thickeners.
The base ingredient is filtered lowfat Grade A milk, so the protein, calcium, and other nutrients come from real dairy rather than fortification. Vitamins A and D are added back in, which is standard practice for reduced-fat milk products.
How It Compares to Whey Protein Shakes
Most ready-to-drink protein shakes use whey protein isolate dissolved in water, sometimes with added casein. Core Power takes a fundamentally different approach by starting with whole milk and concentrating what’s already there. The practical differences come down to a few things: Core Power tends to have a creamier, more natural milk taste. It also contains more fat and calories than a water-based whey shake with equivalent protein, because milk fat comes along for the ride even in the lowfat version.
If your only goal is maximum protein with minimum calories, a pure whey isolate shake in water will be leaner. If you prefer something that tastes like actual dairy and want the slow-release benefit of casein alongside the fast-acting whey, Core Power’s milk-based approach has a real edge.