Optimum Nutrition Gold Standard 100% WheyvsCrazy Nutrition Intensive Pre-Train

Whey is the liquid fraction of milk left after cheesemaking, dried into a protein-rich powder. Gold Standard 100% Whey uses a blend led by whey protein isolate plus whey protein concentrate and a small amount of hydrolyzed whey. It is rich in essential amino acids, especially leucine and the other branched-chain amino acids (5.5g BCAAs per serving), which help trigger muscle protein synthesis via the mTOR signaling pathway. Whey digests quickly, raising blood amino acids soon after intake. Combined with the mechanical stimulus of resistance training, this supports the repair and growth of muscle tissue. The powder simply makes it easy to add concentrated, high-quality protein to your day; it does not do anything food protein cannot, it is just convenient.

Intensive Pre-Train is a multi-ingredient pre-workout you mix with water about 30 minutes before training. Its 200mg of caffeine blocks adenosine receptors to reduce perceived fatigue and sharpen alertness. Citrulline malate (8g, yielding roughly 5.3g L-citrulline) is converted to arginine and then nitric oxide, which can widen blood vessels and support blood flow and the trademark 'pump.' Beta-alanine (3.5g) is a building block of muscle carnosine, an intramuscular acid buffer that, with consistent daily use over several weeks, can help delay fatigue during high-rep sets. Taurine is included for cell hydration and as a general ergogenic, while KSM-66 ashwagandha and EnXtra (Alpinia galanga) extract are added for stress modulation and sustained, lower-jitter focus, and added B-vitamins, vitamin C and other cofactors support energy metabolism. Note that the precise ingredient list (including whether betaine, L-tyrosine or L-arginine are present) has differed across regions and product versions, so check the label on the tub you buy.

The evidence supports whey protein for modest gains alongside training, not this product specifically, since it has not been studied on its own. A 2018 British Journal of Sports Medicine meta-analysis (Morton et al., 49 studies, 1,863 participants) found protein supplementation during resistance training increased one-rep-max strength by about 2.5 kg (2.49 kg) and fat-free mass by roughly 0.3 kg (0.30 kg) versus training alone, with no further fat-free-mass benefit once total protein passed about 1.6 g/kg/day (1.62 g/kg/day). A separate 2018 systematic review and meta-analysis in Nutrients (Davies et al., 13 RCTs from 8 studies) reported small-to-medium effects (effect sizes about 0.4 to 0.7) for whey on the recovery of muscle contractile function from under 24 to 96 hours after exercise, though only half the individual studies showed a benefit. Bottom line: results hinge on consistent training and adequate total daily protein, not on the powder by itself.

There are no published clinical trials on Intensive Pre-Train as a finished product, so efficacy rests on its individual ingredients. Caffeine is the most consistently effective pre-workout ingredient: a 2018 Journal of the International Society of Sports Nutrition (JISSN) brief review identifies it as the primary driver of the acute performance benefits of multi-ingredient pre-workouts, and meta-analytic data show a small but reliable effect on muscular endurance (pooled standardized mean difference around 0.30). A 2021 systematic review and meta-analysis in IJSNEM found citrulline malate produced a small benefit on strength-training repetitions to failure (Hedges's g about 0.20, roughly 3 extra reps or a 6.4% increase, p = .02). Beta-alanine has strong ISSN support, but its benefits come from building muscle carnosine over about four weeks at 4-6g/day, so a single 3.5g serving will not act acutely. KSM-66 ashwagandha has numerous randomized trials supporting stress and recovery outcomes, with more mixed evidence for strength. Notably, a 2022 JISSN crossover trial found a caffeinated pre-workout mainly boosted subjective energy and isometric force, with no additional benefit over placebo on leg press or bench press. Overall: meaningful, evidence-backed core doses, but expect a real-but-modest performance edge, not a dramatic one.

Most healthy people tolerate whey well. Common, usually mild effects come from the lactose and protein load: bloating, gas, stomach cramps, or loose stools, more likely in lactose-intolerant users (the lower-lactose isolate version may help). Drinking too quickly or using too much at once tends to worsen this. Serious reactions are rare but possible: people with a true milk allergy can have an allergic reaction and should not use it (it contains milk and soy). Very high total protein intake can add stress to already-impaired kidneys, so anyone with kidney disease should consult a doctor before use; whey is generally not shown to harm kidney function in healthy adults at sensible intakes. On contaminants, independent 2025 testing by Consumer Reports found measurable lead in most protein powders tested, with dairy-based products averaging far lower levels than plant-based ones, though some dairy products still showed concerning amounts; choosing an NSF Certified for Sport flavor adds independent contaminant and banned-substance screening if this concerns you.

The most common effect is harmless tingling or skin prickling (paresthesia) from 3.5g of beta-alanine, typically starting within minutes and fading within 60-90 minutes. The 200mg of caffeine can cause jitters, rapid heartbeat, elevated blood pressure, anxiety, nausea, headache, GI upset, and insomnia if taken too late; effects are stronger in caffeine-sensitive people or when stacked with coffee or energy drinks. Large doses of citrulline malate or taurine can cause stomach upset in some users. Ashwagandha may cause drowsiness or GI upset and, in rare reports, has been linked to liver injury and thyroid effects. Stop and seek medical care for chest pain, palpitations, fainting, or severe anxiety. Caffeine-related serious events are dose-dependent, so do not exceed one serving, and talk to your doctor if you are unsure whether this product is safe for you.

As of 2026 in the US, the 2 lb tub (about 29 servings) commonly runs about $40 to $55, and the 5 lb tub (about 74 servings) about $70 to $95; the manufacturer's own list price is at the higher end (around $1.89 per serving on its site), while Amazon, Costco, and supplement retailers frequently discount well below that. Realistically that works out to roughly $1.00 to $1.90 per 24g serving depending on size and where you buy, among the better values for a name-brand whey. As a dietary supplement it is generally not covered by health insurance or HSA/FSA. To lower the per-serving cost, buy the larger size, watch for sales, and use subscribe-and-save where available.

As of 2026, expect roughly $40 for a one-time single tub (commonly 20-30 servings depending on the version), with a Subscribe and Save option cutting about 20-30% off, often landing near $1.50-$2.20 per serving, which places it at or slightly above the typical pre-workout price. Multi-tub bundles lower the per-tub cost. Like all dietary supplements, it is not covered by health insurance, HSA/FSA eligibility is generally not available, and there is no pharmacy or GoodRx-style discount. The main risk-reducer is the brand's 60-day money-back guarantee, which effectively lets you trial it; verify current pricing, serving count, and return-shipping terms before buying, as these change over time.

Best for healthy adults doing resistance or strength training who struggle to reach their daily protein goal (roughly 1.6 g/kg/day for muscle building, per the evidence) from food alone. Also useful for generally active people, older adults working to offset age-related muscle loss, and anyone wanting a convenient post-workout protein source. Avoid it, or consult a clinician first, if you have a milk allergy (it contains milk and soy), significant lactose intolerance (consider the pure isolate version), or chronic kidney disease. It is not suitable for vegans. Pregnant or breastfeeding individuals and anyone with a medical condition should check with a healthcare provider before adding any supplement.

Best for healthy adults who lift or do high-intensity training, tolerate caffeine well, and want a stimulant-based energy-and-pump product. It is NOT for people who are caffeine-sensitive, pregnant or breastfeeding, under 18, or who have heart conditions, high blood pressure, arrhythmia, anxiety disorders, or kidney/liver disease. Anyone on stimulants, MAO inhibitors, blood-pressure or thyroid medication, or with thyroid/autoimmune conditions (relevant to ashwagandha) should consult a physician first. Competitive or drug-tested athletes should be cautious: the brand does not publish independent third-party or banned-substance (e.g., NSF Certified for Sport, Informed Sport) testing. Avoid other caffeine sources the same day, and do not take it late in the day due to sleep disruption. This is a dietary supplement, not a treatment for any medical condition.