Kirkland Energy Shot (Costco) vs Ghost Energy: which has more caffeine?

Ghost Energy carries more total caffeine per serving (200mg per 16 oz can vs 180mg per 2 oz shot), but ounce for ounce Kirkland Energy Shot (Costco) is actually the stronger drink at about 90mg per fluid ounce against 12. Which one "has more caffeine" depends on whether you measure the container or the concentration.

Kirkland Energy Shot (Costco) vs Ghost Energy: the numbers

Sources: Kirkland Energy Shot (Costco)'s figure is verified in our Kirkland Energy Shot (Costco) caffeine guide against Caffeine Informer (source); Ghost Energy's figure is verified in our Ghost Energy guide against Caffeine Informer (source).

The concentration gap is the striking part: Kirkland Energy Shot (Costco) packs roughly 7 times the caffeine per ounce. Sipping speed matters at that density; a 2 oz shot finished in minutes hits differently than the same milligrams spread over a slow cup.

Which one should you pick?

Pick Kirkland Energy Shot (Costco) when you want the lighter dose or a slower ramp, and Ghost Energy when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.

For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.

Related reading

• Kirkland Energy Shot (Costco): the full caffeine guide
• Ghost Energy: the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Does Kirkland Energy Shot (Costco) or Ghost Energy have more caffeine? Ghost Energy: 200mg per 16 oz can versus 180mg per 2 oz shot for Kirkland Energy Shot (Costco).

Which is stronger per ounce? Kirkland Energy Shot (Costco), at about 90.0mg per fluid ounce versus 12.5mg for Ghost Energy.