Description

The purest form of MCT — at 99.8% Pure C8. Onyx Nutra's C8 MCT Oil is the gold standard in MCT supplementation: 100% Caprylic Acid (C8:0) sourced exclusively from coconuts, refined to an ultra-pure 99.8% C8 profile. C8 is the most rapidly converted MCT to ketones, making it the most potent choice for brain fuel, metabolic efficiency, and performance. No palm oil, seed oils, or carriers. Keto-friendly, Halal certified. Made in the UK to GMP standards using no GM products. 33 servings of pure, coconut-powered performance.

Delivery

All UK orders are dispatched on a fully tracked service, with delivery expected in 1–2 business days. Please note that orders submitted after 5pm, or on weekends and bank holidays, will be picked up and processed on the next available business day.

For results that last

The purest ketone fuel. Used daily. Felt daily.

C8 (Caprylic Acid) converts to ketones faster than any other MCT — making it the preferred choice for those who want maximum cognitive and metabolic impact. At 99.8% pure C8, there are no fillers, no dilution, and no compromise. Your brain runs on ketones with remarkable efficiency — and unlike glucose, the fuel is clean, consistent, and doesn't spike blood sugar. One tablespoon, every day. Long-term clarity, energy, and metabolic sharpness — the C8 gold standard.

Ingredients & Dosage

Ingredients: Caprylic Acid Triglycerides (C8:0) — sourced from 100% coconuts. Unflavoured.

Free From: Palm Oil, Seed Oils, Carriers, Artificial Flavouring, Colours & Preservatives, Lactose, Yeast & Gluten.

Suitable for: Vegans, Keto Diets, Halal Certified.

Nutritional Information - C8 MCT Oil — Pure Caprylic Acid

Ingredients: Caprylic Acid Triglycerides (C8:0) — sourced from 100% coconuts. Unflavoured.

Free From: Palm Oil, Seed Oils, Carriers, Artificial Flavouring, Colours & Preservatives, Lactose, Yeast & Gluten.

Suitable for: Vegans, Keto Diets, Halal Certified.

Serving Size: 15ml Servings Per Container: 33

Nutrient	Per 100ml	Per 15ml Serving
Energy	4,048 kJ / 985 kcal	607 kJ / 148 kcal
Fat	100g	14g
Carbohydrates	0g	0g
of which Sugars	0g	0g
Caprylic Acid (C8)	99.8g	13.79g

Made in the UK to GMP standards. 99.8% pure Caprylic Acid (C8:0)

FAQs

C8 MCT 100% Sourced Coconut Oil - Gold Standard

Gold Standard MCT Oil

£12.79

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Pure Caprylic Acid (C8)

13.79g per serving
The gold standard at 99.8% purity — the most rapidly converted MCT to ketones.
100% Coconut Sourced

99.8% C8 purity
Sourced exclusively from coconuts — no palm oil, seed oils, or carriers.
Zero Carbohydrates

0g · keto-friendly
The clean keto profile, popular in ketogenic and low-carb lifestyles.
Total Fat

14g per serving
14g of pure medium-chain triglyceride fat per 15ml tablespoon serving.

FAQs

Got questions? We’ve got answers.

What makes C8 MCT Oil different from standard MCT Oil?

C8 (Caprylic Acid) converts to ketones more rapidly than C10 or C12 MCTs. At 99.8% pure C8, this is the most potent and fast-acting MCT formulation available — the gold standard choice for brain fuel and metabolic performance.

What is the C8 purity level?

99.8% pure Caprylic Acid (C8:0) — sourced exclusively from coconuts with no other MCT chains diluting the formula.

Is this suitable for a ketogenic diet?

Yes — C8 MCT Oil is zero carbohydrates, zero sugars, and is one of the most effective supplements for maintaining ketosis and supporting fat-based energy.

Is this Halal ceritfied?

Yes — Halal food certified, keto-friendly, and free from palm oil, seed oils, and carriers. Made in the UK to GMP standards.

How do I use C8 MCT Oil?

Add 1 tablespoon (15ml) to coffee, shakes, dressings, or smoothies. Unflavoured and blends cleanly without altering taste.

Who should choose C8 over standard MCT Oil?

Those who want maximum ketone conversion speed and the purest possible C8 profile — particularly those focused on cognitive performance, ketogenic dieting, or metabolic optimisation.

How many servings per bottle?

Each 500ml bottle provides 33 servings at one 15ml tablespoon per day.

Trusted by over 50,000+ customers

Trust is earned so we prove it

99.8% pure C8 :)

99.8% pure C8 — checked the certificate of analysis. Other 'pure C8' brands are 60-70% in reality. This one is the real gold standard. Mental clarity in the morning has been on a different level.

Catherine W. Cambridge · 21 March 2026

Converts faster than the mixed MCT.

Strict keto since November and the C8 is the most efficient ketone fuel. This product converts faster than the mixed MCT I was on before. Blends into bulletproof coffee perfectly. Best ketone source I've used.

Bilal R. Tottenham · 3 February 2026

Purity in every drop.

Premium pure C8 at a fair price. Four stars because the per-tablespoon cost is higher than the mixed MCT but you're paying for purity. For ketone fuel specifically, this is the one. Energy is more sustained.

Marcus L. Lewisham · 30 March 2026

Best C8 I can find.

Started keto in January and went straight for the best C8 I could find. 99.8% purity is what the research says you want for ketone conversion. This brand delivers and the price is competitive.

Aleksander N. Reading · 26 January 2026

Cognitive focus has been sharper.

Halal certified pure C8 is genuinely rare. Cognitive focus has been sharper, particularly during deep work sessions. The clean keto profile means no carb spike, sustained energy is exactly what's promised.

Ali M. Edgware · 11 April 2026

Customer Reviews

Overall rating: 4.7 / 5 from 32 reviews.

Good service and product Many Thanks

Martin R. 5/5 Verified August 24, 2026

C8 MCT 100% Sourced Coconut Oil - Gold Standard

Good quality product 👌

Justyna Z. 5/5 Verified June 23, 2026

C8 MCT 100% Sourced Coconut Oil - Gold Standard

It’s fine getting some more

John J. 5/5 Verified June 5, 2026

C8 MCT 100% Sourced Coconut Oil - Gold Standard

Store owner replied: Hi John, Thank you for your kind words. Lisa - ONYX NUTRA™

June 8, 2026

I would love to share my experience of my latest purchase, but it hasn't arrived yet. I would be very grateful if you could contact Evri and give them an absolutely massive kick up the ass, ideally after a long run up.

Peter S. 5/5 Verified September 13, 2025

Pure C8 MCT Oil Premium Coconut Oil Keto Friendly

So far so good.

Anthony D. 5/5 Verified August 5, 2025

Pure C8 MCT Oil Premium Coconut Oil Keto Friendly

Noticed my focus is sharper when I have this in the morning, helps power through work emails. �

Diya F. 5/5 Verified May 9, 2025

Description

Delivery

For results that last

The purest ketone fuel. Used daily. Felt daily.

Ingredients & Dosage

Nutritional Information - C8 MCT Oil — Pure Caprylic Acid

C8 MCT 100% Sourced Coconut Oil - Gold Standard