Nexus PER4M RTD - Blue Sour Straps, 500ml

Nexus PER4M RTD - Blue Sour Straps is a ready-to-drink pre-workout from Nexus, built for lifters who want a full training dose without measuring a scoop. Each 500ml bottle carries 160mg of caffeine alongside a wider stimulant and pump blend, and it pours in at $6.79 with one serving per container. If you train hard and want a grab-and-go option instead of a tub and shaker, Nexus PER4M RTD is designed to sit in your gym bag and go straight into your session.

How Nexus Pre-Workout works

The core of Nexus PER4M RTD is 160mg of caffeine anhydrous paired with 65mg of theobromine, a related compound from cacao extract that tends to produce a steadier lift in alertness rather than a sharp spike. Sitting alongside the stimulants is 50mg of L-theanine, an amino acid often used to smooth out the edge that caffeine can bring, plus 30mg of citrus aurantium supplying synephrine. Together these ingredients form the energy side of the Nexus PER4M RTD formula, and how your body responds will depend on your own caffeine tolerance.

The performance side leans on 1200mg of L-citrulline DL-malate, a precursor your body converts toward nitric oxide production to support blood flow during training, plus 1200mg of beta-alanine, an amino acid linked to buffering the acid build-up that contributes to muscular fatigue in higher-rep sets. Taurine at 1000mg and a 50mg dose of Senactiv (Panax notoginseng and Rosa roxburghii) round out the formula, alongside L-tyrosine and acetyl L-tyrosine for cognitive support under training stress.

Why choose Nexus PER4M RTD

Nexus PER4M RTD skips the powder and shaker entirely, so you can crack the bottle and go straight into your session. That matters most on days when you're short on time or training away from home and don't want to carry a tub. A few things set this formula apart from a standard scoop-and-water pre-workout.

• 1000mg of taurine per bottle, an amino acid included alongside the stimulant blend in Nexus PER4M RTD.
• 80mg of vitamin C and 10mcg of vitamin B12 built into the formula, on top of the performance actives.
• Sodium and potassium are both present per serving, useful context if you're tracking electrolyte intake around training.

It's non-carbonated, so there's no bloating or burping mid-set, and at effectively zero calories and 0.1g of sugar per bottle it won't dent a cut or a calorie target the way a sugary energy drink would.

Getting the most from it

Most lifters do best drinking Nexus PER4M RTD around 20 to 30 minutes before their warm-up, giving the caffeine and citrulline time to kick in before the first working set. Because it's a single-serve bottle, there's no measuring involved, which makes it easier to keep your dose consistent session to session. If you're building out a full stack, Nexus PER4M RTD pairs naturally with a creatine supplement taken any time of day, or with a amino acid product for extra support during longer sessions. For lifters chasing a specific physique goal, a protein shake post-workout rounds the day out.

If you're new to full-strength pre-workouts, start on a training day rather than a rest day so you can gauge how the 160mg caffeine dose sits with you. Browse the wider pre-workout range if you want to compare formulas before committing to Nexus PER4M RTD as your regular option.