Guarana (Paullinia cupana Kunth)
The term guarana refers to the dried seeds of Paullinia cupana Kunth, a woody climbing species belonging to the Sapindaceae family, native to the Amazon region (northern Brazil and the Amazon River basin) and now widely cultivated especially in certain areas of Brazil. The plant is grown in hot, humid climates with abundant rainfall distributed over much of the year, on well-drained soils with good organic matter content. The fruits are capsules which, at maturity, split open to reveal dark seeds surrounded by a whitish aril, a characteristic feature that makes the fruit easily recognisable.
From a botanical and morphological standpoint, Paullinia cupana is a climbing shrub with twining stems, compound leaves, and panicle-type inflorescences. The seeds are the main part used and are harvested at full maturity, separated from the pericarp, subjected to drying, and then optionally roasted and milled to obtain a concentrated powder. The commercial product may be marketed as dried whole seeds, powder, or extracts used as ingredients in beverages and food preparations.
The composition of guarana is characterised by a high content of methylxanthines, particularly caffeine (sometimes referred to as “guaranine”), along with theophylline and theobromine in smaller proportions. The seeds also contain tannins, other polyphenols, a fraction of fixed oil (lipids), proteins, fibre, and minerals. The caffeine content can be significantly higher, in percentage terms, than in other plant materials containing methylxanthines, which is why guarana is mainly used as a stimulant ingredient in beverages and food products. The compositional profile is influenced by genetic factors, cultivation conditions, degree of ripeness, and the intensity of roasting and drying processes.
From a technological and commercial perspective, guarana is used particularly by the food industry in the formulation of soft drinks, supplements in powder or dry extract form, and, to a lesser extent, as a component of confectionery and other preparations. The quality of the finished product depends on the origin of the raw material, drying methods, storage conditions (to prevent excessive moisture and contamination), and control of caffeine content and any undesirable residues. In all applications, compliance with current regulations and good manufacturing practice is essential to ensure consistent composition and safe use of guarana in different formulations.
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Botanical classification (APG IV)
Botanical name: Paullinia cupana Kunth.
Common name: guarana (guaranà)
Family: Sapindaceae
Order: Sapindales
Modern clades (phylogenetic):
Angiosperms
Eudicots
Rosids
Domain: Eukaryota
Kingdom: Plantae
Cultivation and growth conditions
Climate
Guaraná requires a humid tropical climate with high average annual temperatures. Optimal growth is generally observed between about 23 and 28 °C, with abundant rainfall distributed through the year. It does not tolerate frost and is sensitive to persistent drops in temperature below the tropical range. High atmospheric humidity, stable warmth, and protection from prolonged drought are essential for correct vegetative and reproductive development.
Exposure
During early growth stages, the plant benefits from partial shade, which limits radiation stress. As it matures, it may be managed in full sun provided adequate soil moisture is guaranteed. Cultivation sites should be sheltered from strong winds, which can damage shoots, inflorescences, and young fruits.
Soil
Guaraná prefers deep, well-drained soils with good porosity and medium to high organic matter. Suitable textures range from loam-sandy to loam-clayey, provided drainage is efficient. Slightly acidic to near-neutral pH (approximately 5.5–6.8) is considered optimal. Waterlogging and soil compaction must be avoided, as both favour root rot and reduce plant longevity.
Irrigation
In its natural habitat, rainfall usually meets most water requirements. Outside the tropical rainforest climate, or during dry periods, supplemental irrigation is useful or necessary. Soil moisture should remain constant, without saturation, especially during seedling establishment, flowering, fruit set, and fruit development.
Temperature
Ideal daytime temperatures lie in the tropical range, roughly from the mid-20s to low-30s °C. Extended exposure to temperatures below about 12–15 °C inhibits growth and may damage tissues, while frost is lethal. High temperatures combined with low humidity may impair flowering, reduce fruit set, and negatively influence seed quality.
Fertilization
Soil fertility management commonly focuses on:
sustained input of organic matter (compost, mature manure, vegetative mulch), which supports soil structure, microbiological activity, and nutrient availability;
balanced supply of macronutrients (nitrogen, phosphorus, potassium) in accordance with phenological stages;
cover crops and rotational planning to maintain soil health, limit erosion, control weeds, and reduce external inputs.
Excessive nitrogen should be avoided, as it predisposes the plant to disease and generates overly lush but structurally weaker vegetation.
Crop care
Pruning: Guaraná is often trained as a low tree or productive shrub to simplify management and harvesting. Pruning includes removal of diseased or senescent wood, structural interventions for canopy balance, and rejuvenation pruning to stimulate new productive shoots.
Soil management: Organic mulching, incorporation of residues, and cover vegetation contribute to moisture retention, weed control, and nutrient cycling.
Plant health: Regular monitoring is important to prevent fungal diseases and the spread of phytophagous insects. Good drainage, balanced nutrition, and correct canopy aeration are primary preventive measures.
Harvest
Harvest occurs when the fruits reach full maturity and the capsules begin to open naturally, exposing the seeds. Timely collection prevents seed fall. After separation, seeds are dried and often toasted before being used in food preparations, herbal products, or industrial processing.
Propagation
Seed propagation: This is the traditional method. Seeds are short-lived (“recalcitrant”) and must be sown soon after collection to ensure germination. Constant humidity and warm temperatures are required for uniform sprouting.
Vegetative propagation (cuttings/clonal material): Used to maintain genetic traits, productivity, and resistance profiles. Cuttings are rooted under controlled environmental conditions and transplanted to the field at the beginning of the rainy season once the root system is sufficiently developed.
Indicative nutritional values per 100 g (dried seed powder)
Energy: ~330–360 kcal
Protein: ~12–14 g
Total carbohydrates: ~50–55 g
Fibre: ~3–5 g
Fat: ~2–4 g
SFA: main fraction of the lipid component
MUFA
PUFA
Minerals: potassium, magnesium, calcium, phosphorus
Vitamins: small amounts of B group vitamins
Sodium: negligible
(Values may vary according to origin, drying technique and product standardisation.)
Key constituents
Methylxanthines (especially caffeine, plus theophylline and theobromine)
Polyphenols (tannins, catechins and other antioxidant compounds)
Starch-based carbohydrates
Vegetable proteins
Lipids containing SFA, MUFA and PUFA
Minerals and B vitamins
Production process
Harvesting of ripe fruits
Seed extraction from the fruit
Drying of seeds (sun-drying or controlled drying)
Optional light roasting to stabilise and enhance aroma
Grinding into guarana powder
Production of extracts (often hydroalcoholic) standardised in caffeine and polyphenols
Physical properties
Dark brown seeds with lighter internal tissue
Fine brown, hygroscopic powder
Herbal, slightly roasted aroma
Limited water solubility for lipids and polyphenols; caffeine itself is water-soluble
Sensory and technological properties
Markedly bitter and slightly astringent taste
Herbal and mildly spicy aroma
Good incorporation into beverages, dry mixes, capsules, tablets and functional foods
Influence on bitterness and mouthfeel due to caffeine and tannins
Food applications
Traditional tonic beverages made from guarana paste or powder
Energy supplements in powder, capsules or tablets
Functional soft drinks and flavoured beverages
Inclusion in bars, bakery products, confectionery
Small additions to smoothies, yogurt, porridges or protein preparations
Nutrition & health
Predominant stimulant action due to caffeine (alertness, reduced perception of fatigue)
Potential antioxidant effect from polyphenolic compounds
Overall low fat contribution, despite the presence of SFA, MUFA and PUFA
Possible mild astringency and reduced tolerance in sensitive individuals
Excessive intake can lead to tachycardia, nervousness, insomnia, irritability and gastric discomfort
Particular caution advised for children, pregnant or breastfeeding women, people with hypertension or high sensitivity to stimulants
Portion note
Typical use level in foods and drinks: ¼–½ teaspoon (about 1–2 g) per serving.
For food supplements, the key parameter is the caffeine content per dose indicated by the manufacturer, and total daily caffeine from all sources should be taken into account.
Allergens & intolerances
Guarana is not among the main regulated allergens
Specific allergies are rare but possible
Reactions can occur in individuals sensitive to caffeine or tannin-rich products
Check possible excipients or carriers (capsules, tablets, blends) that may contain allergens (e.g. soy, milk, gluten)
Storage & shelf-life
Whole seeds: good stability over time; store in a cool, dry place, protected from light
Powder: more exposed to oxidation and aroma loss; store in well-closed containers, away from heat and humidity
Liquid or dry extracts: stability depends on solvent, concentration and packaging; follow producer guidelines (dark containers, tight closure, controlled temperature)
Safety & regulatory
Plant material must comply with general food safety and hygiene requirements (including HACCP-based systems)
Controls for contaminants, residues and microbiological safety are required
For food supplements, the caffeine content must be declared according to national/EU rules, with warnings for sensitive consumers where applicable
Foods and beverages that exceed certain caffeine thresholds must carry specific label statements about caffeine presence
Labelling
On guarana-based foods or supplements the label should indicate:
The ingredient name (e.g. guarana powder, guarana extract)
Full ingredient list in descending order of weight
Nutrition declaration per 100 g or per serving (when required)
Origin (where mandatory or used as a claim)
Batch code and best-before/use-by date
Storage conditions
The caffeine content per serving, where required by law
Clear highlighting of any allergens coming from other ingredients
Troubleshooting
Excessively bitter taste → combine with sweet, aromatic or creamy ingredients to balance flavour
Difficult dispersion in liquids → premix powder with dry carriers or use liquid extracts
Loss of aroma or reduced effect → ensure airtight storage, avoid heat and moisture, rotate stock regularly
Sustainability & supply chain
Cultivated mainly in the Amazon basin, with strong cultural and socio-economic importance
Can support local communities if sourced under fair and sustainable conditions
A sustainable supply chain should protect biodiversity, limit deforestation and respect workers’ rights
Certifications such as organic and fair trade can increase transparency and consumer confidence
Main INCI functions (cosmetics)
In cosmetics, guarana-derived ingredients usually appear as:
Paullinia Cupana Seed Extract → functional ingredient with toning and antioxidant contribution in skin and hair products
Paullinia Cupana Seed Powder / Paullinia Cupana Seed Oil → conditioning, emollient or texturising role in emulsions and topical formulations
Use in cosmetics requires appropriate evaluation of purity, safety, stability and compliance with cosmetic regulations.
Conclusion
Guarana (Paullinia cupana) is a caffeine-rich botanical ingredient containing polyphenols, micronutrients and a balanced lipid component (SFA, MUFA, PUFA in small absolute amounts). It is valued for its stimulating effect, potential antioxidant properties and versatility in both food and cosmetic applications.
When used at moderate doses and with attention to individual sensitivity and total caffeine intake from all sources, guarana can provide functional benefits while maintaining an appropriate safety profile. Correct sourcing, processing and storage are essential to preserve its functional value, sensory quality and safety.
Mini-glossary
SFA – saturated fatty acids; an excess replacing other fats may be less favourable for blood lipid balance.
MUFA – monounsaturated fatty acids; beneficial when replacing part of SFA in the diet.
PUFA – polyunsaturated fatty acids; include omega-6 and omega-3, important for many physiological functions.
HACCP – Hazard Analysis and Critical Control Points; structured food-safety system based on identifying and controlling critical hazards.
Studies
The anti-inflammatory property has been validated by numerous studies that agree on the ability of guarana, simvastatin and caffeine to control and prevent infiamations. However, compounds found in guarana have been shown to be more effective than caffeine in countering inflammation (1).
The activity of guarana, the stimulant of the central nervous system, has demonstrated some protective effects in models of cognitive decline diseases such as Parkinson, Alzheimer and Huntington. Although the mechanisms of this action are still unknown, a hydro-alcoholic guarana extract, for its positive effects, has revealed some potential in the fight against age-related diseases associated with misfolding and protein accumulation (2).
Guarana is a common food for Amazonian populations that enjoy longevity and a low incidence of cognitive decline diseases. This study contributes to the knowledge of therapies that could be useful in preventing or treating disorders associated with aging, and also suggests purinergic signaling as a plausible therapeutic target for longevity studies. (3).
The antioxidant and antibacterial effects observed in guarana extracts are attributed to secondary metabolites present in its composition. Its seeds contain high amounts of methylxanthine, such as caffeine, theobromine and theophylin. Some saponins, polyphenols, and especially tannins are found in good quantities in the fractions of guarana seed extract (4).
Security
The use of dietary supplements has increased recently and the risk of adverse effects may increase if supplements are used improperly (5).
