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Optim D3 - Plant-based Vitamin D3


Take advantage of a discount based on the quantities purchased.
5% for two, 8% for three, 10% for four and 12% for more than five products.

Optim D3 is a food supplement rich in natural vitamin D3 obtained from wild lichen harvested in Canada (plant-based source).

Vitamin D, essential for all ages,

- contributes to the maintenance of normal bones, teeth and muscle function.
- contributes to the normal function of the immune system
- and has a role in the process of cell division.

Optim D3 is registered at the Vegan Society (UK) and is ideally suited for vegetarians and vegans and anyone preferring a food supplement of vegetable origin.

Lactose free Lactose-Free
Gluten freeGluten-Free
Made in BelgiumMade in Belgium

Bio-identical and plant-based vitamin D

Optim D3 is a dietary supplement rich in vitamin D3 (cholecalciferol), 100% natural and entirely of plant origin, derived from wild lichen harvested in Canada.

The vitamin D used in Optim D3 is vitamin D3 (cholecalciferol), the form synthesised by our skin when exposed to the sun.

Highly absorbable form

The vitamin D in Optim D3 is blended with organic coconut oil extract for optimal absorption. Indeed, the oily matrix allows a good bioavailability of vitamin D3 at any time of the day (during a meal or between meals).

A supplement for the entire family:

Optim D3 provides 12.5 mcg (500IU) of vitamin D3 per drop, 250% of the Recommended Daily Allowance. The dosage can therefore be easily adapted according to the person's age (see our advice for use below)

Vitamin D, essential for all ages,

- contributes to the maintenance of normal bones, teeth and muscle function.

- contributes to the normal function of the immune system

- and has a role in the process of cell division.

Serving Size:
Children ages 1 to 10 years old: 1 drop a day

Children above 11 years old and adults: 2 drops a day

Nutritional Information:

1 drop contains 12,5 μg (500 UI) of vitamin D3 = 250% RDA*

2 drops contain 25 μg  (1000 UI) of vitamin D3= 500% RDA*

* Recommended Daily Value

Unscrew the cap and invert the bottle vertically. Wait for 5 to 10 seconds for the first drop to fall. It is not necessary to shake the bottle once inverted.

Precautions for use:

It is advisable to follow recommended doses and have a diverse and balanced diet and a healthy lifestyle—store at room temperature between 15 to 25°C away from light and in a dry place.

At temperatures below 15°C, the oil may partially solidify. This does not affect the quality of the product. The solidified oil becomes liquid again when left at room temperature.

Keep out of reach of young children.

Pregnant and lactating women, seek advice from your doctor or pharmacist.

Organic certified coconut oil extract- Cocos nucifera L. (MCT: medium-chain triglycerides), vitamin D3 – cholecalciferol (Lichen extract – Vitashine®), Antioxidant: mixed tocopherols.

20ml dropper bottle (380 drops)

Gluten-free, lactose-free and registered at the Vegan Society (UK)

Nutritional Information:

1 drop contains 12,5 μg (500 UI) of vitamin D3 = 250% RDA*

2 drops contain 25 μg  (1000 UI) of vitamin D3= 500% RDA*

* Recommended Daily Value

Nutritional Values per 100g:

Carbohydrates: 0g

Lipids: 100g

Proteins: 0g

Energy Value per 100 g: 
831 Kcal/3473 KJ – 1 drop = 0,4 Kcal

Belgian notification number: NUT: 2708/2

The importance of vitamin D

Vitamin D has evolved from a single vitamin to a large prohormone with multiple effects.

Its action is linked to bone mineral metabolism, phosphocalcic balance, and essential effects on multiple cells and mechanisms (cell cycle, endocrine system, immune system, intestinal microbiota…)

Therefore, Vitamin D deficiency is linked to rickets and an increased risk of diabetes, cardiovascular disease, oncology, infection, and autoimmune diseases. (Zaluaga, 2011)

In France, 80% of the population has a vitamin D deficiency (levels below 75 nmol/l, optimal minimum level) (Vernay 2006-07)I

In Belgium, 95% of patients do not reach the recommended value (75 nmol/l). (DAoudi 2009)

Serum calciferol concentrations (25(OH) vitamine D)




< 20 ng/ml

< 50 nmol/L


20 – 30 ng/ml

50 – 75 nmol/L

Recommanded values

> 30 ng/ml

>75 nmol/L


> 150 ng/ml

> 375 nmo/L

1 ng/ml = 2,5 nmol/L


The body absorbs only 10 to 20% of vitamin D through the diet. The “sun” vitamin or vitamin D3 (cholecalciferol) – the most active form – is synthesised in the skin by converting 7-dehydrocholesterol after exposure to UVB (ultraviolet-B) sunlight,

Lack of sun exposure and skin ageing, for example, reduce the synthesis of vitamin D or its active metabolites, so in many cases, without vitamin D supplementation, it is impossible to maintain optimal vitamin D levels, especially during the winter period.

What are the benefits of vitamin D?

Vitamin D is an essential substance for the body as it behaves like a hormone with multiple physiological effects.

There are two forms of vitamin D, but the best known are vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). Vitamin D2 is found mainly in plants. Vitamin D3 is primarily of animal origin, except the one we propose, derived from lichen.

Vitamin D2 (ergocalciferol)
- Mushrooms (chanterelles contain about five mcg / 200UI of vitamin D2 per 100 grams)

Vitamine D3: (cholecalciferol)
- Fish liver oil (1 spoon of 15 ml provides about 34 mcg/1360 IU)
- Fish (salmon, mackerel, tuna, sardines …): between 3 mcg/120UI and 19 mcg/760UI per 100 grams
- Dairy products enriched with vitamin D3
- Egg yolk (about 3 mcg / 120UI per 100 grams)
- Beef liver (maximum 5 mcg/200UI per 100 grams)
- And lichen!

What are the sources of vitamin D?
The main factors of vitamin D deficiency are as follows:

– Age: Older people have a reduced ability to synthesise vitamin D in the skin when exposed to UVB radiation and are more likely to stay indoors or use sunscreen, which prevents vitamin D synthesis. (Holick, 2011)

– Skin pigmentation:
Melanin reduces vitamin D synthesis. People with dark skin need a longer exposure time to UVB rays to produce the same amount of vitamin D as those with fair skin.

– The seasons and where you live: In winter and areas north of the 40th parallel in winter (for people living in the northern hemisphere), the number of photons that reach the Earth’s surface is significantly reduced. People living north of the 40th parallel, i.e. north of the Madrid – Naples line, are probably insufficiently exposed to the sun’s rays to meet their vitamin D needs during the winter period.
Today, most Westerners spend most of their time indoors (home, office, car, etc.). An American study shows that, during summer and at noon, 3 to 8 minutes of sunshine for people with slightly tanned skin and exposing 25% of their skin are sufficient to produce 400 IU of vitamin D in Boston (located at the 42nd parallel). In winter, however, it is almost impossible for the same people to synthesise vitamin D. (Terushkin, 2010)

– Sun protection: Wearing protective clothing and hats, and applying sunscreens, hinders skin exposure to the sun’s rays and reduces vitamin D production. The application of sunscreen (2 mg / cm2) with a sun protection factor (SPF) of 10 reduces UVB radiation by 90% (Balk, 2011).  Be careful: The risk of skin cancer increases when people overexpose themselves to the sun and intentionally present themselves to artificial sources of UV radiation.

– Overweight people: Fat-soluble vitamin D is stored in fat. Obese people may need two to three times more vitamin D than others

– Breastfed children: Daily vitamin D intake is recommended for breastfed infants. Another alternative is for the mother to take a vitamin D supplement to enrich breast milk indirectly.
What are the symptoms of vitamin D deficiency?
Signs and symptoms of vitamin D deficiency may include diffuse bone pain, joint pain, weakness and muscle pain in children and adults, muscle spasms and, in the most severe cases, bone fractures (Heather 2014).

To confirm vitamin D deficiency, it is recommended that you consult a doctor to determine if you need a blood test in which Calcifediol (the vitamin D metabolite) levels are measured.

How much vitamin D should I take?

The amount of vitamin D to be taken is not precisely known and depends on the bodyweight of each person, initial plasma concentrations and the season of the year. The dose must be adjusted individually to achieve the desired concentration. And many researchers agree that the optimal plasma concentrations of vitamin D for it to act as an anti-infective agent and protect against autoimmune diseases are 40 ng/ml (Sabetta, 2010; Mateo-Pascual, 2014; Gruber, 2018; Wimalawansa, 2018).

1000 to 3000 IU per day is recommended depending on the deficiency.

Optim D3 is manufactured in Belgium according to the ISO 22000 standard and the HACCP (Hazard Analysis Critical Control Points) principles, which ensure, among other things, the traceability of the raw material and the quality of the finished product.

Optim D3 ingredients are 100% vegetable (coconut oil extract, vitamin D3 from lichen and natural mixed tocopherols).

We have chosen to have our products certified by the Vegan Society (United Kingdom) for their international reputation and rigorous choice of ingredients.

Did you know that the word Vegan was created in 1944 by the Vegan Society? What does vegan meean?

– No animal products: The manufacture and development of our products does not involve the use of products, by-products or derivatives of animal origin

– No animal testing: As a laboratory, we do not perform any animal testing during the development and manufacture of registered products.

– GMO-free guarantee: We only use GMO-free ingredients, so Optim D3 is ideally suited for anyone who prefers a food supplement of vegetable origin and quality.

Sugar-free – No additives – No sweeteners – Gluten-free – GMO-free guarantee – 100% vegetable origin

Frequently Asked Questions

  • Why do we need to take a vitamin D3 rich food supplement?
    Our diet provides us with a small amount of vitamin D. The moderate exposure of our body to the sun allows our body to synthesise a large part of the necessary vitamin D.

    When our body is not sufficiently exposed (especially in winter), our body synthesises less vitamin D3, and we are therefore more likely to be deficient
  • Why choose a plant-based vitamin D supplement like Optim D3?

    Optim D3 is a natural and vegetable solution to increase its vitamin D3 level. Its concentration is ideal for the whole family: children from one year old and adults.

    The coconut oil extract used in the composition gives it a pleasant taste and excellent stability.

  • Who can take Optim D3?

    Children from 1 to 10 years old: 1 drop per day
    Children over 11 years old and adults: 2 drops per day

    Pregnant and lactating women: consult your doctor or pharmacist to know your needs and adapt the intake accordingly.

  • What is the maximum amount of vitamin D3 I can take daily?

    One drop of OPTIM D3 provides 500 IU/day. 

    The maximum tolerable level in Europe (EFSA) is 4000 IU/day, 

  • Ask your doctor for a vitamin D analysis

    It is always advisable to determine your level of vitamin D (25(OH)vitamin D – Calciferol) and ask a health professional to determine the optimal intake, as several criteria come into play (age, weight, blood levels, illness, medication, etc.).

  • Once I have started treatment, how long do I have to wait to have a blood test to see how my markers are?

    After 3-4 months, to ensure you have a significant increase in 25(OH)vitamin D.

  • Is it better to take vitamin D in drops or tablets?

    We have chosen a dropper bottle with coconut oil because it is easy to take or give. This allows the dose of vitamin D to be adjusted for adults and children. In addition, a recent paper shows that absorption of vitamin D3 from an oil solution (in oil) does not alter its effect if taken with or without meals. (Cavalier et al. 2016)

    Source :

    Cavalier E, Jandrain B, Coffiner M, Da Silva S, De Niet S, Vanderbist F, Souberbielle JC.A Randomised, Cross-Over Study to Estimate the Influence of Food on the 25-Hydroxyvitamin D₃ Serum Level after Vitamin D₃ Supplementation. Nutrients. 2016 May 20;8(5).

  • What is lichen?

    Lichen is an organism resulting from a symbiosis between a fungus (representing 90% of the total) and an alga. Lichen is resistant to extreme conditions: lack of water, high-temperature variations (hot/cold), very low temperatures, intense ultraviolet rays and ionising radiation.

  • Why choose lichen?

    Until now, most of the vitamin D3 supplements available on the market were either synthetic or derived from lanolin (sheep wool).

    The lichen that we have selected grows in the wild in Canada. The species is not threatened, and harvesting takes place seasonally.

    Vitamin D3 from lichen is perfectly adapted for vegetarians, vegans and vegans, as well as for anyone who prefers a natural, sustainable and quality plant origin (without pesticides, GMO-free)

  • Are there any contraindications or drug interactions with plant-based vitamin D?

    In principle, vitamin D has no contraindications. However, if you suffer from hypercalcaemia, allergy to the ingredients in the formula, hypercalciuria or hyperparathyroidism, you should consult a doctor before taking vitamin D.
    With regard to drug interactions, certain groups of drugs, such as anticonvulsants, glucocorticoids, antineoplastics, may increase the metabolism (excretion) of vitamin D and thus decrease 25 (OH) vitamin D (Calciferol) levels.

Optim D3 - Plant-based Vitamin D3