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Guides and tutorials Longevity (Anti-ageing)

The complete guide to polyphenols and food supplements

Polyphenols as a dietary supplement: how to make the right choice?

10/28/2026

Resveratrol, quercetin, EGCG… Polyphenols comprise thousands of molecules with very different properties. To choose a polyphenol as a dietary supplement, you need to consider its family, formulation and bioavailability.

📌︎ Key points

✓Polyphenols are plant compounds found mostly in fruit, vegetables, tea, coffee, cocoa, spices and certain seeds.
✓They are primarily studied for their interactions with oxidative stress and associated cellular mechanisms.
✓Certain polyphenols, such as resveratrol, quercetin and EGCG, are available as dietary supplements.
✓A standardised extract provides a defined quantity of active ingredients, whilst certain micellar or liposomal formulations can improve the bioavailability of poorly soluble molecules.
✓Dietary supplements rich in polyphenols are no substitute for a varied diet and should be chosen based on their composition, dosage and precautions for use.

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Features Immunity

Lactoferrin: a clinical trial puts immune cells to the test

Naturally present in milk and certain secretions, lactoferrin has intrigued researchers. A new trial investigated how the immune cells of adults over 50 reacted to viruses following supplementation.

📌︎ Key takeaways

✓A clinical trial compared two doses of bovine lactoferrin in 103 adults aged over 50.
✓After four weeks, the researchers analysed the response of their immune cells when exposed to viruses in the laboratory.
✓Several immune markers and cell populations showed different changes depending on the dose administered.
✓The participants were never infected: only their immune cells were studied ex vivo.
✓This study provides new insights into the immune responses observed following supplementation, without demonstrating protection against infections.

10/27/2026

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Features Heart & Circulation

High blood pressure: a clinical study evaluates olive leaf extract

Traditionally associated with cardiovascular health, the olive leaf is the subject of clinical research. A new study involving 621 patients with high blood pressure assesses the effects of olive leaf extract on blood pressure.

📌︎ Key takeaways

✓A randomised, placebo-controlled trial assessed olive leaf extract in 621 patients already being treated for high blood pressure, over a 12-week period.
✓Blood pressure was measured over a 24-hour period, both during the day and at night.
✓Mean systolic blood pressure fell by 6.4 mmHg with the extract, compared with 1.5 mmHg with the placebo.
✓These results add to our understanding, but need to be confirmed.
✓A supplement is not a substitute for antihypertensive treatment. Seek advice before taking any supplements and never alter your treatment without medical advice.

10/21/2026

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Guides and tutorials Skin

What is the best dietary supplement for skin and hair?

What if you could work from the inside to boost the vitality of your skin and hair? Find out how to choose the best dietary supplement: key nutrients, criteria for effectiveness and quality, product comparisons and a buying guide.

📌︎ Key takeaways

✓Dietary supplements provide key nutrients to the skin and hair from within.
✓Collagen, hyaluronic acid, zinc, biotin and vitamin C are key active ingredients in nutricosmetics.
✓A high-quality supplement can be recognised by the bioavailability of its ingredients, their traceability and the rigour of the manufacturing process.
✓Several months of regular use are needed to see results.

10/21/2026

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Advice Tiredness

Top 10 foods richest in magnesium: the list and recommended daily intakes

Your body does not produce magnesium: it must be obtained regularly from your diet. Discover ten magnesium-rich foods, their magnesium content per 100g and the intake per serving.

📌︎ Key points

✓Pumpkin seeds provide around 592mg of magnesium per 100g. A 30g portion provides 178mg, which is 47% of the Nutrient Reference Value (NRV).
✓The portion size matters: 100g of cooked periwinkle meat provides 83% of the NRV, compared with 16% for 30g of dark chocolate containing around 70% cocoa.
✓Cramps, twitching eyelids or disturbed sleep: these symptoms alone are not sufficient to diagnose a magnesium deficiency. If they persist, seek medical advice.

10/14/2026

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Features Vision & Hearing

AMD: a large-scale study explores an unexpected role for melatonin

Best known for its role in the sleep-wake cycle, melatonin may also affect eyesight. A large-scale study of medical records has recently revealed an unexpected association between regular melatonin intake and a reduced risk of developing AMD.

📌︎ Key takeaways

✓A large-scale US study investigated the link between melatonin and age-related macular degeneration (AMD) using data from over 180,000 medical records.
✓Regular use of melatonin was associated with a lower risk of developing AMD.
✓In people already living with dry AMD, it was also associated with a lower risk of progression to exudative AMD.
✓This observational study provides promising scientific evidence, but does not allow us to conclude that there is a cause-and-effect relationship.
✓Melatonin is no substitute for regular eye check-ups or prescribed treatments, but it represents an interesting avenue of research into retinal ageing.

10/14/2026

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Features Tiredness

Dietary supplements and seasonality: the annual supplementation calendar

Changes in light, temperature, diet or lifestyle… Your body doesn’t cope with every season in the same way. Find out how to adapt your dietary supplements wisely throughout the year.

📌︎ Key takeaways

✓Seasonal changes influence certain physiological parameters, particularly circadian rhythms and vitamin D levels.
✓In spring, the focus can be on vitality, liver support and defences against seasonal allergens.
✓In summer, antioxidants and flavonoids help manage sun exposure, whilst melatonin can occasionally help you fall asleep.
✓In autumn, probiotics, zinc and vitamin C help prepare the body nutritionally for the colder months.
✓In winter, reduced exposure to UV light very often calls for vitamin D supplementation.

10/06/2026

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Features Gastrointestinal health

Probiotics and the gut: understanding and optimising your microbiota

Probiotics and the gut have a complex relationship. Far from being simply ‘good bacteria’, these microorganisms interact with a unique ecosystem: the microbiota. Find out how to better understand and maintain it.

📌︎ Key takeaways

✓The gut microbiota comprises between 1,000 and 100,000 billion microorganisms, mainly concentrated in the colon.
✓Probiotics do not establish a long-term presence in the gut, which is why it is beneficial to take them regularly or repeat courses as needed.
✓The properties of probiotics depend closely on the strains used.
✓CFU dosage, freeze-drying and gastro-resistant coating are key criteria for choosing the right supplement.
✓Prebiotics, such as inulin and FOS, act as ‘food’ for certain gut bacteria and optimise their colonisation and activity.

10/01/2026

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Features Joints

Osteoarthritis of the hands: a clinical trial tests the turmeric-boswellia combination

Osteoarthritis of the hands can make many everyday tasks difficult. Whilst studies on plant extracts have mainly focused on the knee, a new clinical trial is investigating the potential effects of the turmeric-boswellia combination on osteoarthritis of the hands.

📌︎ Key takeaways

✓ A clinical study evaluated a combination of turmeric and boswellia in 162 people with symptomatic osteoarthritis of the hands.
✓After three months, the reduction in self-reported pain was greater with the study formula than with the placebo.
✓The trial focused on symptoms and did not assess any changes to the cartilage or the disease itself.
✓There are various turmeric and boswellia-based supplement formulations available.
✓Dietary supplements are not a substitute for medical management of osteoarthritis.

09/30/2026

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Features Vision & Hearing

Blueberries: a boon for eye health?

Eye strain, screens, ageing… Blueberries are attracting increasing interest for their potential effects on vision. But what does the science actually say about their link to eye health?

09/25/2026

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