How Much Caffeine Is in Reign? 300 mg per 16 oz Can
Reign Total Body Fuel contains 300 mg of caffeine per 16 oz can in the United States, according to Reign's own FAQ. That is 18.75 mg per fluid ounce and 75% of the FDA's 400 mg daily guideline for most adults. Canadian cans list 180 mg per 473 mL. Storm (formerly Reign Storm) is a separate brand at 200 mg per 12 oz.
Reign caffeine by can and country
| Drink | Can size | Caffeine | mg per fl oz | Share of FDA's 400 mg |
|---|---|---|---|---|
| Reign Total Body Fuel (US) | 16 fl oz | 300 mg | 18.75 | 75% |
| Reign Total Body Fuel (Canada) | 473 mL (16 fl oz) | 180 mg | 11.25 | 45% |
| Storm (formerly Reign Storm) | 12 fl oz (355 mL) | 200 mg | 16.67 | 50% |
| Roon pouch (our product, not a drink) | 1 pouch | 80 mg | n/a | 20% |
Source: reignbodyfuel.com (US and Canada) and stormbev.com FAQs, checked Oct 31, 2026. mg per fl oz and share of 400 mg computed.
Where these numbers come from
Every figure above comes from the brand's own product pages and FAQ sections, not from third-party databases. Per-ounce caffeine and the percentage of the FDA's 400 mg daily figure were calculated from those published numbers. We ran no lab assay and did not drink-test any can for this page. Roon, which publishes this page, sells its own caffeine pouch and links to it below; every Reign and Storm number traces back to a brand or retailer page linked here, so you can check it.
Is 300 mg of caffeine a lot?
One Reign can delivers 75% of the 400 mg a day the FDA cites as not generally associated with negative effects for most adults. Two cans would put you at 600 mg, well past that line.
Reign's own label says the drink is "recommended for 18+" and is not recommended for children, people sensitive to caffeine, pregnant women, or women who are nursing. For a lower threshold, see our breakdown of whether 200 mg of caffeine is a lot.
Why Canadian Reign has less caffeine
Reign's Canadian product page lists 180 mg of natural caffeine per 473 mL can. The can is the same volume (473 mL is 16 fl oz), but caffeine per ounce drops from 18.75 mg to 11.25 mg, putting a Canadian Reign at 45% of the 400 mg daily figure. If you travel between the two countries or order online, check the caffeine line on the label.
How much caffeine is in Reign Storm?
Storm, the standalone brand that evolved from Reign Storm, contains 200 mg of caffeine per 12 oz (355 mL) can with 10 calories and 0 g of sugar, per Storm's FAQ. Current flavors include Harvest Grape, Guava Strawberry, Tropical, and Valencia Orange.
BevNET reports that Storm launched nationwide in the US in May 2026 as a Monster Beverage brand, splitting off from the earlier Reign Storm line. Older cans still bearing the "Reign Storm" name may sit on store shelves. Check the label: if it says Storm (no Reign branding), you are looking at the 200 mg / 12 oz formula.
What else is in a can of Reign?
Reign markets its drink as "Blended with BCAAs, 300mg of natural caffeine, CoQ10 & electrolytes" with "zero sugar, zero artificial flavors, and colors." The full ingredient list from the H-E-B White Haze listing ($2.48 per 16 oz can): carbonated water, citric acid, sodium citrate, natural flavors, L-leucine, caffeine, L-isoleucine, L-valine, sucralose, potassium sorbate, potassium citrate, sodium benzoate, acesulfame potassium, niacinamide (B3), ester gum, magnesium citrate, coenzyme Q-10, pyridoxine hydrochloride (B6), cyanocobalamin (B12).
Does Reign have beta-alanine? The White Haze ingredient list shows none. Formulas can vary by flavor and country, but beta-alanine does not appear on the label we read. The ingredient list does include sucralose and acesulfame potassium.
Reign vs other energy drinks, per ounce
| Drink | Caffeine | Serving size | mg per fl oz |
|---|---|---|---|
| Reign Total Body Fuel (US) | 300 mg | 16 fl oz | 18.75 |
| Storm (formerly Reign Storm) | 200 mg | 12 fl oz | 16.67 |
| Brewed coffee (USDA) | ~95 mg | 8 fl oz | ~11.8 |
For other big-can drinks, see our pages on Bang's caffeine and Monster's caffeine. Brewed coffee averages about 95 mg per 8 fl oz per USDA data. For a broader ranking, see which energy drink has the most caffeine.
Who should skip a 300 mg can
Anyone under 18, pregnant or nursing, caffeine-sensitive, managing a heart condition, or taking stimulant medication should talk to a clinician before consuming 300 mg in a single serving. Reign's label says "recommended for 18+". The FDA notes that toxic effects such as seizures can be seen with rapid consumption of around 1,200 mg, the caffeine in four US Reign cans. If you are unsure, speak with your doctor. For warning signs, see caffeine overdose symptoms.
Related from Roon
- Which Energy Drink Has the Most Caffeine?
- Best Energy Drink to Stay Awake
- How Much Caffeine Is in Rockstar?
Frequently Asked Questions
How long does a Reign last?
Reign does not publish a stated duration for its energy effect. How long caffeine stays with you varies a lot from person to person, so any fixed number of hours for a can would be a guess. What is fixed is the dose: 300 mg in a US can, 75% of the FDA's 400 mg daily figure.
Is Reign discontinued?
No. Reign's US site still lists seven Total Body Fuel flavors, and H-E-B sells Reign White Haze at $2.48 per 16 oz can (checked Oct 2026). The Reign Storm sub-line rebranded to Storm, which may cause confusion, but Reign Total Body Fuel is still active.
Does Reign have beta-alanine?
The Reign White Haze ingredient list on H-E-B does not include beta-alanine. Formulas can differ across flavors and regions, so check the label on your specific can if you want certainty.
Who makes Reign?
Reign Beverage Company LLC is the entity listed in the Reign site footer. Storm (formerly Reign Storm) is a Monster Beverage Corporation brand, per BevNET.
A Smaller Dose That Lasts
A single Reign uses 75% of your daily caffeine budget in one pour. If you would rather spread that budget across a full workday, Roon takes a different approach: 80 mg of caffeine per pouch, paired with 25 mg of methylliberine (Dynamine). In a randomized, double-blind crossover PK study (n=12), methylliberine co-administered with caffeine extended caffeine's half-life from 7.2 to 15 hours and cut oral clearance from 41.9 to 17.1 L/hr, with no increase in peak concentration (study). That study used 100 mg methylliberine and 150 mg caffeine, roughly 4x the methylliberine and 1.9x the caffeine in a single Roon pouch, so the mechanism applies directionally, not as a direct measurement of Roon. A 15-hour half-life describes clearance, not 15 hours of noticeable lift; in practice a pouch carries most people through roughly 6 to 8 hours.
Each pouch goes under the lip, kicks in within 5 to 10 minutes, and pairs 60 mg of L-theanine for smooth focus with no jitters and no crash. If 80 mg feels light, you can use two pouches at once (160 mg) or space them out; cap it at 4 pouches per day, and leave at least 8 hours between your last pouch and sleep. Pricing runs from $9.16 per tin on the 12-tin subscription, as little as $0.61 per pouch. Try Roon.
Sources
- Reign Total Body Fuel US Products and FAQ
- Reign Total Body Fuel Canada Products
- Storm FAQ
- BevNET: Storm Brand Page
- H-E-B Reign White Haze Listing
- FDA: Spilling the Beans: How Much Caffeine Is Too Much?
- USDA FoodData Central: Brewed Coffee (171890)
- Caffeine and Methylliberine PK Study, Journal of Exercise and Nutrition
Written by Roon Team
