caffeine that fits the moment
workflow pairs 20 mg caffeine from guarana with 40 mg l-theanine in each gummy. smaller increments let you choose your caffeine amount for the moment, with the pairing built into every piece.
choose pineapple yuzu or blood orange mango. both flavors are vegan, made with pectin, and come in a resealable pouch of 40 gummies. each gummy contains 2 g sugar.
what does better focus actually mean?
“focus” can mean staying with a repetitive task, moving between rules, spotting the right signal or holding information in mind. researchers separate these abilities so they can measure a change rather than rely only on how alert someone feels.
that makes the research more useful. ask which task improved, how it was scored and what the comparison group received. a result for one ability does not automatically transfer to every other ability.
| the question | what researchers measure |
|---|---|
| can i switch between tasks accurately? | correct responses when the task or rule changes |
| can i stay attentive for longer? | errors or missed signals as time on a task increases |
| am i responding faster? | reaction time on a defined task |
| can i hold information in mind? | performance on a working-memory test |
| do i feel more awake? | self-reported alertness |
[ INSIDE THE RESEARCH ]
40 mg caffeine + 97 mg l-theanine
better task-switching accuracy and reported alertness versus placebo
44 young adults; no significant change in several other tasks.
read the studywhat the research says about the combination
a 2025 systematic review covered 50 randomized trials of tea, l-theanine or l-theanine + caffeine; 15 contributed to at least one pooled analysis. it found small-to-moderate benefits on some attention outcomes compared with placebo, including attention-switching accuracy in the second hour. some other estimates remained uncertain.
the review also disclosed tea-industry funding and author affiliations. read that alongside the methods, the individual trials and the authors’ call for more research outside the laboratory.
task switching and sustained attention ask different questions
switching studies test how accurately a person handles changing instructions. sustained-attention studies ask whether performance holds up while a task continues. the distinction matters when choosing which evidence is relevant to your own question.
we have separated these into two deeper guides, each with the actual study amounts and comparison conditions.
what about working memory and mental fatigue?
a 2008 crossover study tested 150 mg caffeine and 250 mg l-theanine separately and together. the combination improved several outcomes versus placebo, including numeric working-memory response time, sentence-verification accuracy and reported mental fatigue.
working memory, response speed and accuracy describe different parts of attention. the study’s named outcome helps explain where the pairing showed a benefit.
is a 2:1 ratio the important part?
workflow uses twice as much l-theanine as caffeine: 40 mg with 20 mg in each gummy. the ratio describes the pairing; the milligrams tell you the amount.
workflow contains 40 mg l-theanine and 20 mg caffeine from guarana per gummy. the studies in these guides tested other amounts and formulations. choose by the label and your routine, rather than trying to reproduce a trial by taking extra pieces.
[ THE STUDY COMPARISON ]
the amount, the task, the result
four selected human trials, organized by workflow. compare what each study actually tested before applying its headline to your own question.
| study & participants | amounts & comparison | task | finding | important limit |
|---|---|---|---|---|
| giesbrecht et al. · 201044 young adults | 40 mg caffeine + 97 mg l-theaninecombination versus placebo | task switching; testing at 20 and 70 minutes | improved switching accuracy and reported alertness | other cognitive tasks did not improve significantly; no caffeine-only condition |
| foxe et al. · 201227 participants | 50 mg caffeine; 100 mg l-theanine; each alone and combinedfour-condition randomized crossover, including placebo | sustained attention to response task over two hours | reduced errors after the active ingredients versus placebo | combining ingredients added no benefit over either alone at these doses |
| haskell et al. · 2008sample size not stated in the linked abstract | 150 mg caffeine; 250 mg l-theanine; each alone and combinedrandomized placebo-controlled crossover | cognitive tasks and mood ratings | combination improved working-memory response time and sentence-verification accuracy versus placebo | response speed is not memory capacity; results do not establish all-day productivity |
| smit & rogers · 200023 adults | 12.5, 25, 50 or 100 mg caffeine; no l-theaninecaffeine doses versus placebo after overnight abstinence | cognitive performance and mood | cognitive effects across the caffeine doses tested | small acute study; overnight abstinence affects interpretation; 20 mg was not tested |
selection, scope and how to cite
this is an editorial comparison of four trials discussed in our guides, not a systematic review or an exhaustive evidence search. rows summarize the linked abstracts; unreported details stay unreported. findings are study-specific, and none of these trials tested finished workflow gummies.
the 2025 review discussed below adds a broader view. check each paper’s methods and funding disclosures when using its findings. comparison checked october 29, 2026.
cite “workflow, selected caffeine and l-theanine trials” and link to this comparison. the csv includes a source url for every row.
[ TAKE IT WITH YOU ]
define the kind of focus you mean
[ GOOD QUESTIONS ]
a little more clarity
is caffeine + l-theanine better than caffeine alone?
not in every study or for every outcome. a placebo comparison cannot answer that by itself. a sustained-attention trial with separate ingredient conditions found no extra benefit from the combination at its tested doses.
does l-theanine cancel out caffeine?
no. a combination still contains caffeine and contributes to your daily total. these attention findings do not establish protection against sleep disruption or jitters.
how much caffeine and l-theanine is in each gummy?
each workflow gummy contains 20 mg caffeine from guarana and 40 mg l-theanine. both flavors use the same core formula, with 40 gummies per pouch.
sources & further reading
the linked studies examine these ingredients at the amounts shown. workflow’s per-gummy formula is listed separately.
written by workflow. follow the product label. send a question or correction.
