Pre Workout Supplements: Stim & Stim-Free

Stim or stim-free?

• High-stim: Kingslayer. For morning or daytime training when you want maximum energy. It provides 400mg of caffeine per scoop, the full daily amount generally advised for healthy adults, so skip coffee and other caffeine on the days you take it.
• Stim-free: VasoPump, Nitro Pump and Arginine + Citrulline. For evening sessions, anyone sensitive to caffeine, or to stack with your own coffee.

What to look for on the label

• Caffeine per scoop: so you can count it alongside everything else you drink that day.
• Citrulline: most pump formulas are built around it, and 6g or more is common in fully dosed products.
• Beta-alanine: usually around 3.2g per serving.
• A full dose list: every ingredient with its amount, and no proprietary blends.

When to take it

• 20 to 30 minutes before training: mixed with water.
• Late sessions: choose a stim-free formula for anything late in the day.
• Hydration: drink water throughout your session.

Frequently asked questions

What is the best pre workout in the UK?

It depends on when you train and how you handle caffeine. Kingslayer suits daytime training, while VasoPump or Nitro Pump suit evenings and anyone avoiding stimulants.

What is a stim free pre workout?

A pre workout with no caffeine or other stimulants, typically built around citrulline and other pump ingredients.

How much caffeine is in Kingslayer?

400mg per scoop. Do not combine it with other caffeine on the same day.

Why does pre workout make me tingle?

That is beta-alanine. The tingling is harmless and tends to fade with regular use.

Can I take pre workout every day?

Stim-free formulas, yes. Keep high-stim formulas to training days and watch your total caffeine intake.