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Our Promise
60-day Money-Back Guarantee
Made in the UK
Non-GMO & Pesticide-free
No artificial flavours
Vegan Friendly
Naturally Dairy-Free
The Ingredients in our Biotin Complex
Our unique formula contains doses of Biotin, Selenium and Zinc to promote skin, nail and hair health, optimal immune and metabolic function, and more.
Biotin 9990ug
Biotin is an essential vitamin that helps to support healthy hair and skin, promote optimal energy-yielding and macronutrient metabolisms, support psychological functioning, and more.
Selenium 100ug
Selenium supports the maintenance of healthy hair and nails, promotes optimal immune function, helps to protect the body from oxidative stress, and more.
Zinc 4mg
Zinc is a key mineral that provides a multitude of benefits, including supporting skin, hair and nail health. It also helps to protect your body from oxidative stress.
All-in-one nail, skin & hair support
Our Biotin Complex is made using only the most bioavailable ingredients that are highly digestible and provide real and noticeable results.
High potency
Our Biotin Complex delivers 10mg of Biotin, 4mg of Zinc and 200ug of Selenium, providing high and effective daily dosages. Our product is highly effective and provides safe supplementation of all three essential nutrients.
Double-Sourced Biotin With Carrot Extract
Our product contains 10,000ug of Biotin from two sources, including a food source of carrot extract. Carrot extract is not only rich in Biotin, but it also contains Beta-Carotene.
Our capsule shells are the same as those use by Boots (the high street pharmacy) on many of their products.
“I’ve used this company a few times. The products are high quality and reasonably priced. Great communication and Customer Service.”
Verified Customer
"Ik kocht deze om mijn haar te helpen, maar ik merkte al na een paar weken dat ze ook effect hadden op mijn huid en nagels."
Verified Customer
“Who would have thought one little tablet could do so much good?? wow is all I can say. These are the real deal and in my opinion every one should be taking this biotin complex”
Verified Customer
“Skin is clearer than it has ever been, and my hair seems shinier within just a few weeks - I highly recommend these.”
Verified Customer
“Love these supplements. Really genuine , 100% reliable products and service would highly recommend.”
Verified Customer
“My nails were getting so weak and ugly, but this product really turned them around, I have so much more confidence now, THANKYOU”
Verified Customer
“I combine these with the Collagen Complex and let me tell you, I've never looked better! We all know as you age things change, but these help delay it!!!!”
Verified Customer
“Excellent company and products. Placed a second order and very happy with their wonderful service. Love their products and their service.”
Verified Customer
“It's still early days, but the Biotin is proving great for my skin.”
Verified Customer
“My hair has never been shinier, and it's finally growing quickly again. I can't believe it”
Verified Customer
Order Risk-Free now
"We’re confident you will love your results using our Biotin Complex, which is why we’re pleased to offer a RISK-FREE 60-day money-back guarantee on all orders.
If you aren’t 100% satisfied with your results, we will give you a 100% hassle-free refund, no questions asked."
Founder at Theonia
Frequently Asked Questions
If you can’t find the answer below, please don’t hesitate to Contact Us.
HOW SHOULD I TAKE IT, AND WHO IS IT FOR? CAN I TAKE IT LONG TERM?
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- Adults should take one (1) capsule daily with water, ideally with food, or as directed by a healthcare provider. Do not exceed the recommended daily dose.
- This supplement is intended for adults aged 18+. Not recommended for children under 10. Consult your doctor before use.
- Biotin Complex is formulated for regular use as part of your daily nutrient intake. As with all food supplements, it should be used alongside a balanced diet and a healthy lifestyle.
IS IT SUITABLE FOR EVERYONE?
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- Yes. This formula is suitable for both men and women, and is 100% vegan and vegetarian-friendly. It uses a plant-based HPMC capsule and contains no animal-derived ingredients.
- Allergens: Free from gluten, dairy, soy, and artificial additives.
Manufacturing: Made in the EU under GMP-compliant conditions.
WHAT MAKES THIS FORMULA UNIQUE?
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- Theonia Biotin Complex provides:
- 9990 µg Biotin (69.9% from synthetic source + 30% from carrot extract)
- 4 mg Zinc (40% NRV)
- 100 µg Selenium (181.8% NRV)
- 300 mg Carrot Extract (natural source of biotin and beta-carotene)
- It delivers high-strength biotin from two complementary sources to support the health of hair, skin, and nails. Zinc and selenium enhance antioxidant protection and contribute to normal thyroid and immune function. All ingredients are selected for quality, potency, and bioavailability.
WHAT RESULTS CAN I EXPECT?
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- Nutrient effects are typically experienced over time with consistent daily use, as part of a balanced diet and healthy lifestyle. Individual experiences may vary.
ARE THERE ANY POSSIBLE SIDE EFFECTS OR INTERACTIONS?
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- Biotin Complex is generally well-tolerated at recommended doses. In rare cases, excessive biotin may interfere with certain blood tests.
- Consult your healthcare provider before use—especially if you are pregnant, breastfeeding, taking medication or other supplements, have a medical condition, are due for surgery, have any sensitivities, questions, or concerns.
- Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.
HOW SHOULD I STORE THIS SUPPLEMENT?
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- Store in a cool, dry place away from sunlight and moisture. Reseal the bottle tightly after each use.
WHAT IS YOUR RETURN POLICY?
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- We offer a 60-day money-back guarantee. If you're not fully satisfied, contact our support team for return instructions. Orders are shipped from our warehouse within one working day. Delivery times vary by region.
Don't just take our word for it...
Thousands of people love this product - Find out why!
Fuel Your Inner Glow & Unleash Your Potential
Experience the Benefits of Our Biotin Complex
Experience the transformative power of our Biotin Complex, a symphony of Biotin, Selenium, and Zinc, meticulously designed to nourish your hair, nails, and skin from within. This nutrient-rich blend delivers concentrated doses of essential minerals and vitamins that work in synergy to support healthy hair, nails and skin, optimal immune function, a healthy carbohydrate and fatty acid metabolism, and more.
“I am so impressed! My nails and my hair have grown so much since starting this Biotin Complex only a handful of weeks ago. I am loving the skin-loving benefits it’s giving me, too.”
Raven M.
