Green coffee extract or caffeine anhydrous. Same energy, very different read on an ingredient panel. MAC Energy named its source and put PurCaf® right on the can. More brands are doing the same, and the research explains why.
When Conor McGregor's team built MAC Energy, they had every incentive to cut corners on caffeine. Synthetic caffeine anhydrous costs a fraction of the botanical alternative, and most energy drink drinkers can't tell the difference by taste alone. But that's not how you win.
Instead, the energy drink's formula stacks three separately branded, research-referenced ingredients: goBHB® ketones, Cognizin® citicoline, and 200mg of PurCaf® natural caffeine from green coffee beans. McGregor has been showing up everywhere holding a can since launch, with "Clean Energy" positioning on the label. But underneath the marketing, this is a formula built by people who could have gone cheaper on energy, and chose not to.
MAC Energy isn't alone. Across energy drinks and pre-workouts, a growing list of brands are calling out natural, coffee-derived caffeine by name instead of quietly listing "caffeine anhydrous" and moving on. Sure, some of that is trend-chasing. But some of it, as it turns out, is backed by real pharmacokinetic data that most marketing campaigns never even bother to mention.
So this raises a fair question: what's actually different about "natural caffeine", is any of it backed by real research, and who's got the best and most-trusted forms?
This article explores the science and the story behind PurCaf®, the industry's leading natural caffeine platform from our partners at Applied Food Sciences. Before diving in, you can sign up for our news alerts to get notifications on all AFS content ahead:
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What "Natural Caffeine" Actually Means
All caffeine, regardless of source, is the same molecule: 1,3,7-trimethylxanthine. What differs is how it gets into the powder that ends up in a can or capsule, and what ends up coming along for the ride.
Synthetic caffeine is manufactured to meet United States Pharmacopeia (USP) specifications, which require a minimum of 99.5% pure caffeine, although we unfortunately have seen less than that. The remaining ~0.5% is allowed to include manufacturing impurities and residual solvents left over from synthesis.
Green Coffee Beans. Image provided by Applied Food Sciences
Natural caffeine, by contrast, is extracted directly from a plant source, most commonly green (unroasted) coffee beans, and typically lands in the 95% to 98% purity range. The remaining few percent is made up of naturally occurring plant compounds that traveled along with the caffeine during extraction, not manufacturing byproducts.
Neither purity level is unsafe on its own. It's mostly a difference in manufacturing and labeling, not a safety one, but demanding consumers have begun to care more and more about what's really in those "leftover percentage points". Ultimately, while similar, natural and synthetic caffeine aren't identical ingredients, and that gap is where the rest of this story lives:
Enter PurCaf®: AFS's Answer
Applied Food Sciences (AFS) has built its caffeine business around the natural side of that equation. AFS calls itself the world's leading caffeine supplier, with more than 6 billion servings of clean energy behind it. The company runs a dedicated Research and Development Innovation Center at the University of Iowa BioVentures Center, complete with molecular biology labs, advanced analytic labs, and a pilot production plant. Chances are, you've seen their most widely-used ingredient:
PurCaf® is AFS's flagship green coffee caffeine, manufactured using a proprietary clean-water extraction process that avoids the organic solvents commonly used in botanical extraction. Green extraction methods like this have become a specific focus of recent research into how caffeine and its companion compounds are pulled from coffee and other plant matrices.[1] The result is a fully water-soluble, clear-to-colorless powder with a more neutral taste profile, standardized to at least 95% caffeine, Non-GMO Project Verified, and GRAS (Generally Recognized As Safe).
That GRAS status matters to anyone using or formulating with the ingredient. As Justin Prochnow of Greenberg Traurig LLP has put it over a decade ago, "A fundamental aspect of beverages is that all ingredients must be approved food additives or GRAS. As a company that has already achieved 'self-affirmed GRAS' status for caffeine, AFS is clearly out in front of the rest of the marketplace." [2] For a brand building a new beverage, that's one less regulatory question standing between formula and shelf, and Applied Food Sciences was ahead of its time seeing where the explosively-growing beverage market was headed.
AFS manufactures PurCaf® through a fully integrated supply chain, maintaining control and visibility from raw material to finished ingredient. It begins by sourcing green coffee directly from coffee growers through a Responsible Sourcing Initiative, which emphasizes ethical practices and environmental leadership. From there, AFS maintains strict control over production by working exclusively with trusted, GMP-certified extraction partners operating to stringent U.S. quality and safety standards. Even when working with longstanding industry partners, AFS does not leave anything to chance. Its Foreign Supplier Verification Program (FSVP), internal quality controls, and independent third-party testing are used to verify identity, purity, safety, and consistency throughout the supply chain. That level of oversight becomes especially important with highly purified botanical caffeines, which are at higher risk of adulteration. AFS employs third-party isotopic testing to independently confirm that the caffeine's profile is consistent with its natural botanical origin. The result means that from seed to label, brands receive naturally derived, fully traceable, highly controlled, and independently verified green coffee caffeine they can trust.
The PurCaf Family: Different Grades for Different Goals
Here's the part most formulators don't know: PurCaf isn't just one ingredient. AFS has built it into a small family of green coffee extracts, each aimed at a different use case.
Coffee Drinkers live longer.[3] But does that mean anything to PurCaf? No, not yet at least.
- PurCaf®, "The Industry Standard," is 98% pure caffeine. Because caffeine makes up nearly all of the extract, its statement of identity on an ingredient label is simply "caffeine", specifically green coffee caffeine.
- PurCaf® + Coffee Fruit, "The Whole-Coffee Story," takes natural caffeine beyond the coffee bean. Standardized to 80% caffeine, the remaining 20% comes from upcycled coffee fruit, or cascara, the nutrient-rich skin and pulp surrounding the coffee bean. While the fruit surrounding the coffee bean has a pleasant flavor and nutritional value, the fruit has historically been treated as a byproduct of coffee production. Instead of simply discarding it, PurCaf® + Coffee Fruit captures more of the coffee plant in a single, differentiated ingredient. The result is a high-potency natural caffeine with a richer origin story and the opportunity to share a compelling narrative about whole-fruit utilization and upcycling with consumers.
- PurCaf® + Antioxidants, "The Better-For-You-Energy," goes even further, standardizing to 40% caffeine and 45% chlorogenic acid (CGA). CGA is one of the most bioavailable antioxidants bringing more benefits from coffee to the consumer. This version of the lineup also supports a potential labeling benefit for brands whose consumers care.
PurCaf® + Antioxidants is materially different from its other variants. Standardized to 40% caffeine and 45% chlorogenic acids, it remains a multi-component green coffee extract rather than essentially purified caffeine. That distinction can provide a stronger basis for declaring the ingredient by its botanical common or usual name, "green coffee extract." For certain products, such as a fortified iced tea or cold brew line, that can have meaningful implications for how the ingredient story appears on-pack. However, the recommended best practice is still to clearly disclose that the finished product contains caffeine and communicate the total caffeine content per serving.
From a consumer-facing standpoint, "green coffee extract" can read very differently on an ingredient panel than "caffeine anhydrous," or even the more generic "natural caffeine." It gives the energy source a recognizable botanical identity while also reflecting the chlorogenic-acid content that makes this ingredient fundamentally different from purified caffeine.
Same Caffeine, Extra Compounds
The obvious question is whether any of this changes how the caffeine itself behaves in the body. A 2018 crossover pharmacokinetic trial compared 60mg of caffeine from green coffee bean extract against 60mg of synthetic USP caffeine in 16 healthy men, tracking blood levels over four hours. Caffeine's peak concentration and total systemic exposure came out statistically equivalent between the two sources, with geometric mean ratios of 97.77% and 98.33%.[4] In plain terms, the caffeine molecule itself doesn't statistically hit any harder or softer depending on where it came from.
But what the same trial also found is the more interesting part. The natural extract delivered measurable amounts of three health-supporting chlorogenic acid compounds into the bloodstream, which the synthetic version simply doesn't provide.[4]
A separate crossover trial comparing green coffee extract, guayusa leaf extract, and a synthetic control found similar results across the board: both natural sources were bioequivalent to synthetic caffeine by FDA pharmacokinetic standards, and green coffee's effect on epinephrine release was statistically similar to the synthetic control.[5] Guayusa happens to be the base of AFS's other caffeine platform, AmaTea, which gets its own story next month. For now, the honest framing isn't that natural caffeine works differently from synthetic. It's that you get the same caffeine, plus something extra riding along with it -- and no chemical solvents.
The Antioxidant Bonus
That "something extra" is where the PurCaf + Antioxidants grade earns its name and deserves more attention. Green, unroasted coffee retains far more chlorogenic acid than roasted coffee, since roasting degrades much of this polyphenol content.[6] That's a big part of why green coffee, not roasted coffee, is the extraction target for this kind of ingredient in the first place.
Experiential Differences Seen in Other Research
The major Chlorogenic Acids in Coffee[7]
On the experience side, a randomized, placebo-controlled crossover trial in older adults tested a decaffeinated green coffee blend (not PurCaf®) against an isolated 540mg chlorogenic acid dose and a placebo. The whole coffee blend, not the isolated compound alone, significantly improved sustained attention and decision speed relative to placebo, along with alertness ratings relative to both the isolated compound and placebo. Both the coffee blend and the isolated compound showed a non-significant trend toward less jitteriness than placebo.[8] That lines up with a smaller pilot crossover study that tracked urinary cortisol in healthy adults: after two weeks of green coffee, free cortisol dropped from roughly 126 to 76 nmol per day, while it climbed after two weeks of black coffee.[9]
Chlorogenic acid research extends into cardiovascular territory too. A 2024 dose-response meta-analysis pooling 10 randomized trials and more than 560 participants found green coffee bean extract lowered systolic blood pressure by an average of roughly 3mmHg and diastolic by about 2mmHg, with the largest reductions in people who started with elevated readings.[10]
It's worth being direct about this, though: the above body of research covers green coffee bean extract and chlorogenic acid broadly, across a range of brands and standardizations, not PurCaf® specifically. PurCaf's antioxidant-forward grade is built around this same compound class, but AFS hasn't published ingredient-specific clinical data on it. However, the earlier science is extremely promising, and there's a large amount of research on the benefits of chlorogenic acids.
Why Coffee-Derived Caffeine Builds Trust
Coffee and tea are, after water, the two most consumed beverages on the planet, and caffeine is the most widely used behaviorally-active substance in the world, with the overwhelming majority of it coming from those two sources.[11] That familiarity really helps on a label. A retail shopper who's never heard of some novel nootropic will still recognize "naturally-sourced caffeine from coffee" instantly, and that recognition builds trust before a single study gets cited.
AFS backs that trust with traceability that most botanical suppliers don't bother publishing. The company's Good Coffee Growing Practices initiative works with certified farms in India, covering fair wages, worker safety, water conservation, and a strict no-child-labor policy. Every batch that reaches AFS's warehouse, a SQF-certified facility in Kerrville, Texas, goes through botanical identity verification, USP and AOAC testing for active compounds, screening for contaminants and microbial pathogens, isotope testing to rule out synthetic adulteration, and a certificate of analysis before it ships.
The isotope testing is worth calling out: It's how AFS confirms a batch is what it claims to be (rather than synthetic caffeine dressed up as botanical), and it's paired with Foreign Supplier Verification Program compliance under the Food Safety Modernization Act for imported material. Sad as it is to say, manufacturers have caught "natural caffeine" sources that are merely caffeine anhydrous spiked with a touch of chlorogenic acid. Not with AFS, not ever.
So for a brand putting "natural caffeine" on a can, that's the paper trail you need to back the natural claim up.
PurCaf® in Action: Back to MAC Energy
MAC Energy's can lists 200mg of PurCaf® caffeine per 12oz serving, alongside 2g of goBHB® ketones and 250mg of Cognizin® citicoline. The brand's own positioning leans into an all-hours use case, from a 6am pre-gym can to a 10pm streaming session, and caffeine is doing the heaviest lifting across every one of those occasions. Leave it to Conor McGregor to slam 200mg of quality caffeine at night -- but we generally don't recommend that.
Regardless, caffeine is the single most consistently effective ingredient in the entire dietary supplement industry, with a large body of research behind its effects on vigilance, reaction time, and sustained attention at doses well below 200mg.[12] Caffeine also carries established ergogenic benefits for the training crowd, who a McGregor-fronted brand is clearly courting.[13]
Whether PurCaf's antioxidant content adds a noticeably smoother experience on top of that is still more anecdotal than demonstrated, as the research above shows. But the formula choice itself, natural over synthetic, at a real 200mg dose, in a launch backed by someone with no shortage of cheaper options available, says something about where the category is headed. McGregor and his crew went all in on this launch, and when you go all-in, you go with PurCaf®.
At 200mg per can, MAC Energy sits well inside the dosage range linked to improved vigilance and attention, yet far enough below the upper recommended limits. This allows it to cap intake at two cans per day, with advice against use for anyone caffeine-sensitive, pregnant, nursing, or under 13.
Note: You can shop for MAC Energy using PricePlow.
Beyond PurCaf: The Natural Caffeine Category
Green coffee isn't the only natural caffeine source getting this kind of attention. AFS's own portfolio includes AmaTea®, built on guayusa leaf from the Amazon, which showed up in the same head-to-head pharmacokinetic comparison referenced above and carries its own body of research, including a notable study on gaming performance.
That's a story for next month. For now, the broader pattern holds: as more brands put their caffeine source on the label instead of burying it in fine print, expect more of this kind of side-by-side scrutiny, not less.
Ultimately, it comes down to this: discerning consumers have tired of "caffeine anhydrous", and smart brands are leveling up with natural caffeine sources.
If you want to keep track of what AFS does next with PurCaf®, AmaTea®, and the rest of its ingredient lineup, sign up for AFS news alerts below.
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