Olivia Royer

Olivia Royer

Dr en Pharmacie

Their articles


My review of Kosbiotic after a 2-week course

A French brand founded in 2021, Kosbiotic specializes in dietary supplements of patented probiotics. Olivia Royer, PharmD and scientific editor, analyzed and tested these probiotics for two weeks.

Is shilajit safe? What the science says

It’s touted as aphrodisiac, energizing, and anti-aging… But is shilajit, sometimes contaminated with toxic substances, safe? We look at what the studies say.

7 must-have essential oils for your home

Essential oils have become daily must-haves. I share the 7 essential oils you should always have at home to take care of yourself and your house.

Best cat litter: 5 good reasons to choose plant-based litter

Eco-friendly, natural, and better for your cat: plant-based litter is an appealing alternative to traditional cat litters. I share five reasons to adopt it and give your little companion a healthier, more comfortable environment.

Should you take glycine or collagen?

In the world of nutrition, collagen and glycine are often compared. Are they complementary or interchangeable? Let’s decode what the studies say to help you choose between the two.

CBD: a natural alternative to relieve pain?

Chronic pain, inflammations, muscle aches2
6 D CBD is put forward as a natural alternative to painkillers. But what does the science say?

Does CBD really improve sleep?

Insomnia, nighttime awakenings, stress… CBD is touted as a natural solution to improve sleep. What does science say about its potential effects?

Are omega-3s dangerous? What the science says

Known for their benefits for heart health and vision, can omega-3s be dangerous to your health? What are the side effects of their consumption? Several studies have examined the issue.

Hydratis, the brand that optimizes hydration

Since 2020, the Hydratis brand has offered an innovative oral rehydration solution in the form of flavored tablets to dissolve in water. The goal? To help maintain good daily hydration.

A French and organic spirulina: Nutri&Co’s new bet

To promote local production and ensure exceptional quality, the brand Nutri&Co is launching a French spirulina this spring, certified organic and available in a limited edition.

5 foods to avoid if you have polycystic ovaries

Do you, like 8 to 13% of women of childbearing age, suffer from polycystic ovary syndrome? To ease symptoms and live better with this condition, I recommend avoiding these 5 foods.

Nutricosmetics: a nutritional approach to beauty

By merging nutrition and cosmetics, nutricosmetics offers a different approach to beauty. Between a rapidly expanding market and a trend that has certain limits, I unpack this phenomenon for you that is being talked about more and more.

5 probiotic strains that support intimate flora

For the good health of intimate areas, the vaginal flora must maintain its balance. Which probiotic strains can be consumed to protect this fragile microbiota?

What are the side effects and contraindications of GABA?

Taking GABA dietary supplements is known for their anxiolytic and anti-stress properties and their positive influence on sleep quality. But what are their side effects and contraindications?

What you need to know about bovine collagen

Bovine, marine, ovoderm—collagen supplements on the market come from various animal sources. What are the specific characteristics of bovine collagen? I answer all your questions.

Is collagen really beneficial for hair?

In addition to its effects on skin and joint health, collagen is credited with benefits for hair. What do recent studies say about this?

5 unexpected benefits of carrot juice

A nutritional goldmine, carrot juice is a popular drink. What are the positive effects of this mildly sweet juice? Recent studies have examined the topic.

The effects of cortisol on weight gain

Lack of physical activity and an unbalanced diet can promote weight gain, but hormonal factors are also involved. In this context, what role does cortisol, the stress hormone, play?

Marine collagen and cancer: what the science says

As marine collagen supplements and cosmetic creams flood the market to improve skin appearance and joint comfort, scientific studies are examining the link between collagen and cancer.

How long should my collagen regimen last?

Supplementing with collagen can be beneficial for delaying the effects of aging on the skin and joints. But what is the optimal duration of your supplement regimen?

Should you favor Type II collagen?

Collagen owes its popularity to its potential beneficial effects on the youthfulness of the skin and joints. Should type II collagen be favored, particularly for the joints?

9 grandmother’s remedies to lower blood sugar

Whether you have diabetes or not, keeping your blood sugar normal is essential for health. Here I share 9 effective home remedies to naturally maintain the proper level of sugar in your body.

Is turmeric dangerous for the liver?

Despite its various health benefits, is turmeric dangerous to the liver? That’s what an ANSES alert indicates, but under certain conditions.

5 habits to lower your gamma-GT (almost) effortlessly

The presence of gamma-GT is perfectly normal, but an increase indicates liver distress. Here are 5 habits to adopt to lower your gamma-GT without radically changing your daily routine.

The 7 best oils to promote hair growth

Having long, healthy hair can seem out of reach for certain hair types. Discover my tips and 7 plant and essential oils known to stimulate hair growth.

Does ‘plant-based collagen’ really exist?

In cosmetics and nutricosmetics, so-called ‘plant collagen’ is credited with benefits for skin health and beauty. But this term is misleading, since collagen is animal-derived. Here’s why.

9 vitamins to fight hair loss

Losing hair every day is normal, but if you find more than usual on your brush, there may be a vitamin deficiency. Which ones should you add to your diet to prevent hair loss?

10 natural anxiolytics for stress and anxiety

While prescriptions for medications have never been so numerous, there are natural solutions to manage everyday anxiety. Discover these 10 natural anxiolytics and my tips for regaining emotional balance.

The 10 best natural antifungals

Skin, genital, mucosal… Fungal infections, often benign, remain very unpleasant. I recommend these 10 natural antifungals to help you overcome your fungal infections.

Can an iron deficiency cause anxiety?

Fatigue, headaches, palpitations are all consequences of iron deficiency. I explain here why this deficiency could also cause psychological symptoms such as anxiety.

Does vegan collagen really exist?

Marine or bovine collagen? That’s the question people most often ask about the source of this supplement. But for vegans, is there really an alternative?

What to do in case of postpartum hair loss?

Shiny, resilient hair: the nine months of pregnancy have positive effects on the beauty of your hair. But after childbirth, the postpartum period is sometimes accompanied by significant hair loss. Why does this happen? How can you restore vitality to your hair?

How long does digestion take?

We often think digestion is limited to the hours after a meal. However, it’s a much longer process! How long does digestion take? What factors influence it?

Is Ricoré bad for your health? 

Ricoré, a drink particularly well-known in northern France, has been a staple on breakfast tables since the 1950s. What is it made of? Does it have harmful effects on health? Any benefits?

5 dietary supplements to lower cortisol

Irritability, fatigue, weight gain… If you experience these symptoms, your cortisol level may be too high! Which dietary supplements should you take to balance this stress hormone?

7 signs that your liver is sick

Essential to the body’s proper functioning, the liver can be affected by various conditions that aren’t always obvious. These 7 signs, however, can alert you.

Ovoderm®: an effective vegetarian collagen?

Ovoderm is a patented active ingredient found in dietary supplements. Rich in collagen and other compounds, it is said to be beneficial for the skin and joints. But what is it really?

Does glutathione pose a danger or have side effects?

Often considered the king of antioxidants, glutathione reduces oxidative stress and acts as a liver detoxifier. But what precautions should be taken? Does it pose any danger or have side effects?

Is folic acid beneficial for hair? 

An essential vitamin for the body’s functioning, folic acid is credited with benefits for hair health and beauty. What are its effects?

Is royal jelly dangerous?

Royal jelly is credited with benefits for immunity and menopausal symptoms. But does it have side effects? Any contraindications? What are the risks involved?

Is royal jelly beneficial for hair?

A staple hive product, royal jelly is reputed to offer many benefits, particularly for hair. But what’s the real story?