Strength

Creatine monohydrate has the strongest evidence base for improving strength output, supported by a meta-analysis in the Journal of Strength and Conditioning Research showing 5 to 10% improvements in maximal strength. Protein supplementation at 1.6 to 2.0 grams per kilogram of body weight per day supports the muscle protein synthesis needed for strength gains. Beta-alanine improves performance in the 1 to 4 minute high-intensity range that characterizes many strength-endurance efforts. HMB, a metabolite of leucine, has some evidence for reducing muscle protein breakdown during intense training periods, though benefits are more pronounced in less-trained individuals. These supplements work alongside a structured resistance training program, not as substitutes for it.

Endurance athletes who include resistance training in their program benefit from the same strength-supporting supplements as strength athletes. Research published in the Scandinavian Journal of Medicine and Science in Sports found that concurrent strength and endurance training improved running economy, time-to-exhaustion, and time-trial performance. Creatine and adequate protein intake support the strength training component. For endurance athletes who do not resistance train, strength supplements provide little benefit because the training stimulus required to produce strength adaptation is absent. The supplement supports the adaptation from training; it does not replace the training itself.

HMB, or beta-hydroxy beta-methylbutyrate, is a metabolite of the amino acid leucine that has been studied for its role in reducing muscle protein breakdown. Research results are mixed, and the evidence for well-trained athletes is limited. Studies show more consistent benefits in individuals new to resistance training; for athletes with an established training history, the incremental benefit of HMB above adequate protein intake is small and not reliably demonstrated in recent literature. If used, the typical studied dose is 3 grams per day, divided into three 1-gram servings taken with meals. Athletes with high training loads or during periods of caloric restriction may have the most rationale for trialing it.

Protein provides the amino acid building blocks required for muscle protein synthesis, the process that repairs and strengthens muscle fibers after resistance exercise. Research published in the British Journal of Sports Medicine conducted a systematic review and meta-analysis finding that protein supplementation augmented changes in muscle strength and size during resistance training in healthy adults. The effect was most pronounced when total daily protein intake exceeded 1.6 grams per kilogram of body weight. The protein source matters less than the total daily amount, though leucine-rich sources like whey provide a stronger acute stimulus for muscle protein synthesis.

Stronger muscles, tendons, and connective tissue are more resistant to the repetitive loading that characterizes endurance sports. Collagen peptides with vitamin C have been studied for potential support of connective tissue health; research published in the American Journal of Clinical Nutrition found that collagen supplementation with vitamin C increased markers of collagen synthesis when consumed before exercise, though direct clinical evidence for injury reduction in athletes remains limited. Creatine supports the quality of strength training sessions that build injury-resistant tissue. Adequate protein ensures the raw materials for tissue repair are available. Vitamin D and calcium support bone health. No supplement directly prevents injuries, but supplements that support the physiological processes underlying tissue strength and resilience contribute to a lower injury risk when combined with appropriate training.

Creatine should be taken daily, including rest days, because the goal is to maintain saturated intramuscular creatine stores. Muscle protein synthesis remains elevated for 24 to 48 hours after a resistance training session, so protein intake on rest days supports the ongoing recovery and adaptation process. HMB, if used, should also be taken daily for consistent anti-catabolic support. The timing on rest days is less important than consistency. Taking supplements at the same time each day, regardless of whether you train, maintains steady physiological levels and builds the habit that ensures compliance over the weeks and months required to see measurable results.

Creatine monohydrate and a quality protein source provide the most evidence-backed strength support relative to their cost. At 5 grams per day, creatine is among the most affordable supplements available, and a single tub typically covers one to two months. One to two daily protein servings from a quality whey or plant-based source rounds out the foundation. Together, this stack addresses the two most important nutritional levers for strength development: energy availability for high-intensity work and amino acid availability for muscle repair. Adding beta-alanine extends the stack at modest additional cost. Beyond these three, the cost-benefit ratio of additional supplements diminishes substantially for most athletes.