Sports Research® 100% Whey Protein Isolate Chocolate Peanut Butter - U.S. Sourced Protein Powder w/BCAAs -No Artificial Flavors or Gums- Informed Sport Tested · Gluten Free- 2lb Bulk Bag, 25 Servings

Clinical trials typically use 20-40g per serving, 1.6-2.2g/kg/day total protein for athletes. Sports Research 100% Whey Protein Isolate Chocolate Peanut Butter delivers 25g whey protein isolate + 6.9g BCAAs + 1,000mg L-Leucine per serving, which we classify as Therapeutic relative to that range.

See the "Also consider" section below for two alternatives. Choose based on form preference (Powder vs alternatives), dose adequacy, and third-party testing.

Yes — Informed Sport. Third-party testing verifies ingredient identity and label accuracy.

Yes — Amazon Subscribe & Save is available for this product. Enrolling locks in a recurring delivery at a reduced per-unit price.

Whey protein isolate does not interact with most medications. However, if you are on antibiotics (particularly quinolones or tetracyclines), spacing your protein shake and medication by 1-2 hours is advisable as calcium in whey can slightly reduce absorption. Individuals on kidney-protective medications or with renal disease should consult their doctor before high-protein supplementation.

Whey protein isolate is well tolerated long-term in healthy individuals. Because most of the lactose is removed in the isolate filtration process, GI side effects are minimal compared to concentrate forms. Prolonged very-high protein intake above 2.2g per kg of bodyweight daily has not shown harm in healthy adults, though moderation and dietary variety are advised.

Whey isolate has less than 1% lactose, making it far better tolerated than whey concentrate for people with lactose sensitivity. The absence of xanthan gum and artificial sweeteners further reduces the GI irritation common in heavily formulated protein powders. A small subset of users with true whey or milk protein allergies should avoid it entirely.

Yes — this whey pairs well with creatine monohydrate, pre-workouts, and multivitamins. The added Vitamin D in the formula should be counted toward your total daily D intake to avoid exceeding 4,000 IU from all sources. Avoid mixing with high-fiber supplements in the same shake as it may affect texture.

Mix one scoop in 8-10 oz cold water or milk. Consume within 30-60 minutes post-workout for maximum muscle protein synthesis benefit. Do not exceed 2 servings daily as sole protein strategy — whole food protein sources should remain the dietary foundation. Store sealed in a cool, dry place.

Acute muscle protein synthesis response occurs within 1-3 hours after consumption. Visible lean mass gains from consistent training plus adequate protein intake typically emerge after 4-8 weeks of regular use in conjunction with resistance training. Strength improvements may be noticeable within 2-4 weeks.