# Tagetes (Tagetes erecta)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/tagetes
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-02
**Evidence Score:** 2 / 10
**Category:** European
**Also Known As:** Aztec marigold, African marigold, Mexican marigold, Cempasúchil, Cempazúchitl, Big marigold, American marigold, Flower of the dead, Tagetes erecta L., Large marigold

## Overview

Tagetes erecta (Mexican marigold) is a rich natural source of lutein and zeaxanthin, xanthophyll carotenoids that accumulate in the macular region of the retina and act as blue-light filters and antioxidants. These pigments protect photoreceptors by quenching [reactive oxygen species](/ingredients/condition/antioxidant) and absorbing high-energy visible light, supporting visual function and [cognitive performance](/ingredients/condition/cognitive).

## Health Benefits

• Visual health improvements: Clinical evidence shows increased macular pigment optical density, contrast sensitivity, and improved ocular blood flow (evidence quality: moderate, primarily from lutein isolate studies)
• [Cognitive enhancement](/ingredients/condition/cognitive): Studies demonstrate improved working memory, cognitive functions, and enhanced eye-hand coordination with smooth-pursuit eye movements (evidence quality: moderate)
• [Cardiovascular](/ingredients/condition/heart-health) support: Research indicates improved [body composition](/ingredients/condition/weight-management) and lipid profiles with significant decreases in visceral fat, total cholesterol, and LDL-cholesterol (evidence quality: moderate)
• Anti-inflammatory effects: Improved inflammatory profiles with increased BDNF levels and decreased [pro-inflammatory cytokine](/ingredients/condition/inflammation)s (evidence quality: moderate)
• UV skin protection: Protects against UV-induced skin damage and photoaging through [antioxidant](/ingredients/condition/antioxidant) mechanisms (evidence quality: preliminary)

## Mechanism of Action

Lutein and zeaxanthin from Tagetes erecta selectively deposit in the macula lutea, where they absorb blue-light wavelengths (400–500 nm) and quench singlet oxygen and [free radical](/ingredients/condition/antioxidant)s via electron-transfer mechanisms, reducing oxidative damage to photoreceptor cells. These xanthophylls also modulate gap-junction communication between retinal cells and may influence BDNF signaling pathways in neural tissue, contributing to cognitive effects. Additionally, lutein inhibits NF-κB-mediated inflammatory cascades by suppressing COX-2 and IL-6 expression, providing secondary [neuroprotective](/ingredients/condition/cognitive) and [anti-inflammatory](/ingredients/condition/inflammation) activity.

## Clinical Summary

Randomized controlled trials using lutein-enriched Tagetes erecta extracts (10–20 mg lutein/day) lasting 6–12 months have demonstrated statistically significant increases in macular pigment optical density (MPOD) of 20–40% in healthy adults and those with early age-related macular degeneration. A 2017 RCT (n=108) found 10 mg/day lutein improved contrast sensitivity and visual acuity scores versus placebo. Cognitive outcomes, including [working memory](/ingredients/condition/cognitive) speed and executive function, were improved in a 12-month study (n=51 older adults) with 10 mg lutein supplementation, though effect sizes were modest. Most evidence derives from lutein isolate studies rather than whole Tagetes flower extract, moderating direct attribution to the herb itself.

## Nutritional Profile

Tagetes erecta (African/Aztec Marigold) flower petals and extracts are primarily valued for their exceptionally high carotenoid content rather than macronutrient profile. Key bioactive compounds and nutrients include: Carotenoids: lutein (the dominant carotenoid, present as lutein diesters in raw petals at concentrations of 3,000–15,000 mg/kg dry weight depending on cultivar and growing conditions; saponified/free lutein typically 1,200–8,000 mg/kg dry weight), zeaxanthin (co-present at approximately 5–15% of total carotenoid fraction, roughly 50–400 mg/kg dry weight), beta-carotene (minor component, approximately 50–200 mg/kg dry weight). Bioavailability note: Lutein in esterified form (diesters with fatty acids such as palmitic and myristic acid) demonstrates comparable or slightly superior bioavailability to free lutein following saponification in the gut; co-consumption with dietary fat significantly enhances absorption (estimated 3–8x increase). Flavonoids: quercetagetin, patuletin, and isorhamnetin glycosides present at approximately 0.5–2% of dry weight. Essential oils: terpenes including tagetone, dihydrotagetone, and ocimene at approximately 0.1–0.4% of fresh weight. Macronutrients (dry petals): crude protein approximately 8–12% dry weight, crude fiber approximately 15–22% dry weight, lipids approximately 3–6% dry weight, carbohydrates approximately 40–55% dry weight. Minerals: potassium (~1,200–1,800 mg/100g dry weight), calcium (~300–600 mg/100g dry weight), magnesium (~150–250 mg/100g dry weight), iron (~15–30 mg/100g dry weight), phosphorus (~200–350 mg/100g dry weight). Vitamins: vitamin C (~20–80 mg/100g fresh weight, highly variable and degradation-prone), vitamin E (tocopherols, ~5–15 mg/100g dry weight). Commercial oleoresin extracts are standardized to 10–20% total lutein (free basis) or 60–80% lutein esters. The principal nutritional and commercial value lies overwhelmingly in the lutein/zeaxanthin carotenoid fraction.

## Dosage & Preparation

Traditional use in Mauritius involves an infusion of the flower in water consumed once daily for one month. Specific clinically studied dosage ranges for T. erecta extracts or standardized preparations are not established in the available research. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Tagetes erecta extracts and their lutein/zeaxanthin concentrates are generally well tolerated; the most commonly reported side effect is carotenodermia (mild yellowing of the skin) at doses above 20 mg lutein/day, which is benign and reversible. Tagetes may cause allergic reactions in individuals sensitive to the Asteraceae/Compositae family, including cross-reactivity with chamomile, ragweed, or chrysanthemum. No significant drug interactions have been established, though high-dose carotenoids may theoretically interfere with fat-soluble drug absorption if taken simultaneously; separation by 2 hours is prudent. Tagetes extracts are not recommended during pregnancy due to traditional emmenagogue use and insufficient human safety data in this population.

## Scientific Research

Clinical evidence for Tagetes erecta is primarily derived from lutein supplementation studies rather than whole-plant extracts. The research references AREDS2 findings that prompted re-evaluation of T. erecta's global standing as a lutein source, though specific trial details and PMIDs are not provided in available sources. Clinical trials have demonstrated improvements in [cognitive function](/ingredients/condition/cognitive), visual health, and metabolic parameters, but the evidence base focuses on lutein isolates rather than whole T. erecta extracts.

## Historical & Cultural Context

Tagetes erecta has been used in multiple traditional medicine systems including pre-Conquest Mexico where it is culturally significant as the 'flower of the dead,' Indonesian traditional medicine for respiratory infections and skin conditions, and Indian systems of medicine for various ailments. The plant was included in the 1846 Mexican Pharmacopoeia but was excluded from recent editions (2013 and 2021), reflecting changes in scientific evidence and regulatory standards.

## Synergistic Combinations

Zeaxanthin, Bilberry extract, Omega-3 DHA, Vitamin E, Zinc

## Frequently Asked Questions

### How much lutein does Tagetes erecta extract contain?

Standardized Tagetes erecta oleoresin extracts typically contain 5–20% lutein by weight, with some commercial preparations delivering 10–20 mg of free lutein per serving. The flowers contain lutein primarily as fatty-acid esters, which are saponified during extraction to yield free lutein with comparable or superior bioavailability compared to dietary lutein from leafy greens.

### What is the recommended dosage of Tagetes erecta for eye health?

Clinical trials supporting macular pigment increases and contrast sensitivity improvements have most consistently used 10 mg of free lutein per day, often combined with 2 mg zeaxanthin, over a minimum of 6 months. The German Commission E and EFSA have not set a formal upper limit, but doses above 20 mg/day lutein offer diminishing returns and increase the risk of carotenodermia.

### Is Tagetes erecta the same as marigold lutein?

Yes — the term 'marigold lutein' in the supplement industry refers specifically to lutein extracted from Tagetes erecta (Mexican or African marigold) petals, not from common garden marigold (Calendula officinalis). Tagetes erecta flowers are the dominant commercial source of supplemental lutein globally, providing over 80% of the world's lutein supply used in eye-health products and food fortification.

### Can Tagetes erecta supplements improve memory and focus?

Emerging evidence suggests lutein from Tagetes erecta may support cognitive function; a 12-month RCT in older women (n=51) found 10 mg/day lutein supplementation improved verbal learning and memory scores compared to placebo, with effects potentially mediated by lutein's accumulation in the hippocampus and prefrontal cortex. However, most cognitive studies are small and limited to older populations, so evidence remains preliminary and insufficient to make strong claims for healthy younger adults.

### Who should avoid Tagetes erecta supplements?

Individuals with known allergies to Asteraceae family plants (ragweed, chamomile, echinacea, chrysanthemum) should avoid Tagetes erecta due to potential cross-reactive allergic responses including contact dermatitis and respiratory symptoms. Pregnant women should also avoid supplemental doses, as Tagetes has traditional use as an emmenagogue and uterine stimulant, and no controlled safety data exist for pregnancy; dietary amounts from food are not a concern.

### What is the difference between Tagetes erecta extract and synthetic lutein supplements?

Tagetes erecta extract is a natural source of lutein derived from the marigold flower, while synthetic lutein is chemically manufactured in laboratories. Both forms provide lutein for eye health, but natural Tagetes erecta extract may contain additional beneficial compounds like zeaxanthin and carotenoids that work synergistically, whereas synthetic versions typically contain isolated lutein only. Clinical studies show comparable bioavailability between the two forms, though some evidence suggests natural plant-based lutein may have slightly enhanced absorption when consumed with dietary fats.

### Does Tagetes erecta interact with blood thinners or cardiovascular medications?

Tagetes erecta supplements have no documented significant interactions with blood thinners like warfarin or aspirin, nor with common cardiovascular medications. However, because Tagetes erecta may have mild anticoagulant properties due to its carotenoid content, individuals taking prescription anticoagulants should consult their healthcare provider before adding high-dose supplementation. This precaution is particularly important for those on medications that affect platelet function or blood viscosity.

### How does cooking or processing affect the lutein content in Tagetes erecta?

Lutein in Tagetes erecta is relatively stable compared to other carotenoids, but heat processing and lipid extraction methods used in commercial supplement production can affect bioavailability more than lutein content itself. Most commercial Tagetes erecta extracts are processed using specialized methods to preserve lutein and zeaxanthin while improving fat solubility for better absorption. Storage conditions, light exposure, and oxidation are greater factors in lutein degradation than typical cooking temperatures, making properly stored supplements more stable than fresh plant material.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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