Dogs
Bioavailability: CBD in MCT oil generally has higher bioavailability than some encapsulated forms, particularly those without oil. Studies show CBD oil (often MCT-based) hits higher peak concentrations (C_max of 625–845 ng/mL) and total
exposure (AUC of 135–297 minμg/mL) compared to non-oil capsules like microencapsulated beads (C_max 346–578 ng/mL, AUC 98–162 minμg/mL), suggesting a 30–45% edge. However, VetChoices CBD gel caps, which use MCT oil as the vehicle, likely perform closer to MCT oil tinctures than to dry capsules, which can dip as low as 0–19% bioavailability due to digestion losses.
Absorption Rate: MCT oil’s liquid form speeds things up, hitting peak levels (T_max) in 1–2 hours by mixing well with stomach contents and skipping some breakdown steps. Non-oil capsules might take 2–3 hours to dissolve and absorb, but VetChoices gel caps, with MCT oil inside, could match the tincture’s pace, outpacing dry powder forms.
Cats
Bioavailability: Data for cats is sparse, but CBD’s bioavailability is lower overall than in dogs. MCT oil likely beats non-oil capsules, with one study showing a CBD paste (oil-based) reaching 282 ng/mL at 2 hours for 1.37 mg/kg. Non-oil capsules might lag 10–20% behind, though we lack direct comparisons. VetChoices gel caps, using MCT oil, should align more with tincture-level bioavailability, giving them an edge over dry capsules.
Absorption Rate: In cats, oil-based CBD peaks around 2 hours, boosted by fat content in fed states. Non-oil capsules could stretch to 2–4 hours due to dissolution time, but VetChoices gel caps with MCT oil likely keep pace with tinctures at 1–2 hours, making them faster than powder-based options.
Key Differences
MCT Oil (Tincture): Offers high bioavailability (20–40% above non-oil capsules) and quick absorption (1–2 hours) thanks to its liquid, fat-soluble nature.
Encapsulated CBD: It’s a mixed bag. Dry powder capsules lag in both bioavailability and speed (2–4 hours), while oil-based gel caps—like VetChoices with MCT oil—can rival tinctures in both metrics.
New Twist
VetChoices CBD gel caps using MCT oil as the vehicle blur the line between tinctures and capsules. Unlike dry capsules, they could deliver bioavailability and absorption rates nearly identical to MCT oil drops, which might catch pet owners off guard expecting a bigger gap.
So, for dogs and cats, CBD in MCT oil tinctures edges out non-oil capsules in bioavailability and speed, but VetChoices gel caps with MCT oil likely close that gap significantly. If you’re weighing options, it’s less about “tincture vs. capsule” and more about whether the capsule has oil inside—check the label! For tailored advice, especially with cats’ limited data, a vet’s the way to go.