Whey Protein Isolate Chocolate Flavored by Thorne

If you lift, run intervals, or do CrossFit and struggle to hit 25–35 g of protein per meal, whey protein isolate is a clean way to close the gap. It’s also useful for adults over 40 focused on preserving lean muscle during fat loss, and for people who want dairy protein with minimal lactose. Compared to whey concentrate, isolate brings more protein with fewer carbs and fats, which helps if you’re calorie-tracking.

Whey is rich in leucine, the amino acid that flips on mTOR (the cell’s switch for building new muscle). Hitting the leucine “trigger” drives muscle protein synthesis for hours after training. Whey typically provides about 10–12% leucine by weight, so 21 g of protein delivers roughly 2–2.5 g—enough for most adults to stimulate repair and growth. It’s rapidly digested, so amino acids show up in the blood quickly when you take it after workouts.

Mix one packet in 8–12 ounces of water or milk and drink within 1–2 hours after training. On rest days, use it to bring meals up to 25–35 g of protein. If breakfast is light, add a shake there. Active adults typically do best at 1.2–1.6 g of protein per kilogram of body weight daily, with older adults toward the higher end. Combine with carbs post‑workout if fast glycogen refueling matters to you.

Avoid if you have a true milk protein allergy. Whey isolate is low in lactose, but not zero—severe lactose intolerance still warrants caution. If you have chronic kidney disease or a history of kidney stones, discuss total protein targets with your clinician first. Separate from levodopa by several hours because dietary protein can interfere with its absorption. If whey predictably worsens your acne, choose a non‑dairy protein instead.