Best MCT Oil 2026: Pure C8 vs C8/C10 Blends, by Cost per Tablespoon
Informational summary — not medical advice. This page ranks product value and label transparency; on whether MCT oil works, see the hub and the ketosis evidence. MCT oil can cause dose-dependent GI distress if not titrated gradually. This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
If you're buying MCT oil for ketones, C8 content is what you're paying for — coconut-heavy blends are closer to coconut oil. Of the 6 products tracked here, only 1 discloses an exact C8 content that makes a true cost-per-gram-C8 comparison possible: Bulletproof Brain Octane C8 MCT Oil, a 100% caprylic-acid oil, at $0.061/g C8 — a real premium for certainty. The other 5 products are C8/C10(/C12) blends or coconut-derived oils that don't disclose their exact ratio, so their true ketogenic cost-per-dollar is unknowable. Cheapest per tablespoon among liquids is Sports Research Organic MCT Oil at $0.38/tbsp — but it's the broadest chain-length blend, meaning less C8-concentrated. Powder is ranked separately since it's diluted by a fiber carrier and not gram-equivalent to oil.
As an Amazon Associate we earn from qualifying purchases. Ranked by computable cost per gram of C8 first, cost per serving second, never commissions.
The one-line takeaway Only one product here lets you compute a true cost per gram of C8 — because it's the only one that's 100% caprylic acid. Everything else is a tradeoff between a lower sticker price and an unknown, likely smaller, C8 delivery per dollar. Neither choice is wrong; know which one you're making.
Liquid MCT oil, ranked
Sorted by computable cost per gram of C8 first (one product qualifies), then cost per tablespoon. Full data is a public CC BY JSON file.
| Product | Composition | $/tbsp serving | Disclosed C8 | $/g C8 |
|---|---|---|---|---|
| Bulletproof Brain Octane C8 MCT Oil | Liquid oil, 100% caprylic acid (C8) | $0.86 | 14 g | $0.061 |
| Sports Research Organic MCT Oil | Liquid oil, C8/C10/C12 coconut-derived blend | $0.38 | Not disclosed | Unknowable |
| Nature's Way Organic MCT Oil | Liquid oil, coconut-derived (chain length not disclosed) | $0.56 | Not disclosed | Unknowable |
| Bulletproof C8 & C10 MCT Oil | Liquid oil, C8/C10 blend (ratio not disclosed) | $0.59 | Not disclosed | Unknowable |
MCT powder, ranked separately
Powder uses an acacia or tapioca fiber carrier, so a gram of powder is not a gram of MCT fat. Cost below is per a standardized 15g powder-weight reference — not a claimed serving, and not gram-equivalent to the liquid-oil rows above. Always check your label's actual scoop size and stated MCT-mg per scoop.
| Product | Composition | $/15g reference | Disclosed C8 | Note |
|---|---|---|---|---|
| Nutricost C8 MCT Oil Powder (95% C8) | Powder, 95% caprylic acid (C8) oil load (carrier dilution ratio not disclosed) | $0.97 | Not disclosed per-serving | 95% C8 disclosed for the oil fraction only; carrier dilution not stated |
| Sports Research Organic MCT Oil Powder | Powder, C8/C10 from coconut with acacia-fiber carrier | $1.12 | Not disclosed per-serving | Fiber-carrier diluted; no C8 ratio disclosed |
Prices are live Amazon buy-box figures, July 2026; they move. Cost per serving = price ÷ servings per container. Liquid servings use the standard ~15mL/1 tbsp convention; powder servings use a standardized 15g powder-weight reference. Cost per gram C8 = price ÷ (servings × DISCLOSED C8 grams per serving) — null where the label doesn't state that figure.
Two label traps worth reading before you buy
"C8/C10 blend" tells you almost nothing about ketogenic potency. C8 is roughly 3x more ketogenic than C10 and 6x more than C12/lauric acid at identical doses (St-Pierre 2019), so a 50/50 C8:C10 blend and a 90/10 blend are meaningfully different products sold under the same label phrase — and none of the blends tracked here disclose the exact ratio. Coconut-derived "MCT oil" without any chain-length disclosure (the Nature's Way-style product in this comparison) is the least transparent version of this trap, since coconut oil itself is dominated by C12, the least ketogenic chain length.
The Nutricost powder's "95% C8" claim is real but easy to misread. The label discloses that the oil load is 95% caprylic acid — genuinely the highest-C8 powder tracked here — but it does not disclose what fraction of the total powder weight is that oil versus the fiber carrier that makes it dry-mixable. That means you cannot compute grams of C8 per scoop from the label alone, even though the oil purity figure itself is a real and useful disclosure. This site does not estimate a dilution ratio to fill that gap; the field is left honestly blank.
Frequently asked questions
What is the best MCT oil?
If buying for ketones, C8 content is what you're paying for. Only 1 of 6 products discloses an exact C8 gram figure; the pure-C8 pick has the only computable cost-per-gram-C8, at a real price premium.
Why isn't there a cost-per-gram-C8 ranking for every product?
Most labels state a blend or coconut-derived source without an exact ratio — unknowable from the label, not just omitted. Even the 95%-C8 powder doesn't disclose its carrier dilution.
Is MCT powder cheaper than MCT oil?
Not gram-for-gram — powder is diluted by a fiber carrier. Shown here per a standardized 15g powder-weight reference, not claimed as oil-equivalent.
Should I buy pure C8 or a blend?
Pure C8 is most ketogenic per gram at a real premium. A blend costs less per tablespoon but delivers a smaller, less-certain ketogenic effect per dollar.
Related
- MCT oil: what it actually does
- MCT oil dosage guide — start with 1 tsp, not 1 tbsp
- MCT oil and ketosis
- MCT oil vs. coconut oil
Sources
- Manufacturer labels and live Amazon pricing for all listed products, July 2026. Full dataset: /mct-oil/cost-by-brand.json (CC BY 4.0).
- St-Pierre V, et al. "Plasma Ketone and Medium Chain Fatty Acid Response in Humans Consuming Different Medium Chain Triglycerides During a Metabolic Study Day." Front Nutr. 2019. PMID: 31058159
- Norgren J, et al. "Ketosis After Intake of Coconut Oil and Caprylic Acid-With and Without Glucose: A Cross-Over Study in Healthy Older Adults." Front Nutr. 2020. PMID: 32351966