Sublingual CBD Oil: What You Should Know Before You Take It

The sublingual route is one of the most studied forms of administration of cannabidiol (CBD) in scientific research. It consists of placing a few drops of CBD oil under the tongue to facilitate its absorption through the buccal mucosa.

In this guide we explain in general terms what the sublingual route is, how the absorption of CBD by this route works, what research says about the effect times and what are the main differences compared to other forms of use. The information contained in this article is for information purposes only.

In several European countries, the regulation of CBD for oral or sublingual use is not uniform. While in countries such as Switzerland, Canada or the United States the sale of CBD products for internal use is authorized, in most of the European Union CBD oils are marketed exclusively for external use (topical use).

The sublingual route allows CBD to be absorbed directly through the blood vessels under the tongue. According to available research, this may facilitate faster absorption and greater bioavailability compared to oral ingestion. Effects usually appear within approximately 30 to 45 minutes [1].

What is the sublingual route of CBD?

Sublingual administration consists of placing a liquid – in this case CBD oil – under the tongue for a short period of time before swallowing. This area of the mouth is formed by a network of small blood vessels (capillaries) with a high absorption capacity.

When CBD oil is held in contact with the sublingual mucosa, some of the cannabidiol can pass directly into the bloodstream without traveling through the digestive system. This differentiates it from ingestion, where CBD must pass through the digestive tract and liver before reaching the general circulation [1,3].

Difference between sublingual and oral route

Although both involve taking CBD oil into the mouth, the sublingual route and the oral (ingestion) route work differently. In the oral route, CBD is swallowed directly and passes into the stomach and intestine, where it is absorbed and transported to the liver.

In the sublingual route, part of the CBD is absorbed through the buccal mucosa before being swallowed. This difference has implications for the speed of absorption and the amount of CBD that reaches the body in active form [1].

Absorption and bioavailability of sublingual CBD

Bioavailability is the percentage of a substance that reaches the bloodstream in active form. According to available research, the sublingual route may offer higher bioavailability of CBD compared to oral ingestion [1].

The main reason is that sublingual absorption allows CBD to partially avoid the so-called first-pass hepatic metabolism. When a substance is ingested, it passes through the liver before reaching the blood. In the liver, enzymes metabolize part of the CBD, which reduces the amount that reaches the bloodstream in active form.

First-pass liver metabolism

When CBD is administered sublingually, some of the cannabidiol passes directly into the bloodstream without first passing through the liver. This means that a higher proportion of CBD can reach the body in its active form compared to direct ingestion [1,3].

It is important to note that the oil that is swallowed after being held under the tongue does travel through the digestive tract. Therefore, the sublingual route combines a more direct initial absorption with a slower subsequent absorption through the digestive system.

In the case of Cannactiva, CBD oils are marketed for external use and are not intended for internal use.

How long does it take for sublingual CBD to take effect?

According to available research, the effects of sublingually administered CBD usually appear within approximately 30 to 45 minutes [1]. This time may vary depending on individual factors such as body weight, metabolism or the amount administered.

The peak blood concentration is generally between 1.5 and 2 hours after administration, according to data from pharmacokinetic studies [2].

Duration of effect of sublingual CBD

The duration of the effect can vary significantly depending on the person and the amount used. In general terms, it is estimated that the effects of sublingual CBD can be maintained between 3 and 6 hours, although some research reports longer durations depending on the dose [1,2,3].

These data are from studies conducted in controlled settings and may not apply identically to all individuals. Individual response to CBD is variable.

Differences between sublingual CBD and other routes of use

There are several ways to use CBD products. Each has its own characteristics in terms of speed of absorption, bioavailability and duration of effect. The main differences are described below from an informative point of view.

Sublingual CBD vs. oral ingestion

The main difference is the route of absorption. In ingestion, CBD passes through the digestive system and liver before reaching the bloodstream. In the sublingual route, part of the CBD is absorbed directly through the buccal mucosa [1].

This may result in a faster onset of effect and greater bioavailability of sublingual CBD versus ingestion. The effects of the oral route usually take longer to appear (around 60 to 90 minutes), but their duration may be similar or slightly longer.

Sublingual CBD vs. topical use

CBD products for topical use – such as CBD creams and cosmetics – are applied directly to the skin. Their action is localized and CBD practically does not reach the bloodstream [1,3].

The sublingual route, on the other hand, allows a systemic absorption: the CBD passes into the general circulation and is distributed throughout the body. These are two forms of use with different objectives and mechanisms.

Route of use	Onset of effect (approx.)	Duration (approx.)	Type of absorption
Sublingual	30-45 min	3-6 hours	Systemic (buccal mucosa)
Oral (ingestion)	60-90 min	4-6 hours	Systemic (digestive route)
Topical (creams)	Variable	Variable	Localized (skin)

The availability of each format depends on the country’s regulations. Cannactiva CBD oils are marketed for topical use.

Factors that may influence the effect of sublingual CBD

The response to sublingual CBD can vary from person to person. Some factors that research has identified as relevant are:

• Amount of CBD: the dose used influences the intensity and duration of the effect. It is recommended to consult a professional before using CBD for any purpose.
• CBD oil quality: the composition of the oil, the type of extract (full spectrum, broad spectrum or isolated) and the purity of the product can influence the results. If you want to learn more about the differences between oils, check out our guide to buying CBD oil.
• Individual factors: body weight, metabolism, age and individual tolerance to CBD are variables that can modify the response.
• Administration format: according to research, the format (pipette drops vs. spray) may affect the rate of absorption and peak blood concentration [4].

Cannactiva CBD oils are not sold for oral or sublingual use.

General precautions on the use of CBD

CBD is a compound considered safe according to the available scientific literature. However, there are some important precautions:

• Consult a physician before using CBD, especially if you are taking medication. CBD may interact with certain drugs.
• Pregnancy and breastfeeding: it is recommended to avoid the use of CBD products during these stages, unless expressly indicated by a doctor.
• Side effects: these are infrequent and usually mild. Based on clinical trial data, they may include dry mouth, mild drowsiness or temporary decreased appetite [5,6].
• Minors: CBD products are not intended for persons under 18 years of age.

If in doubt, always consult a health professional.

Regulation of CBD for sublingual use in Europe

The regulation of CBD for oral or sublingual use varies significantly between countries. In the European Union, the evaluation of CBD as aNovel Food by EFSA has not been concluded. This means that, in most member countries, CBD products are not authorized for internal use as a food supplement.

In countries such as Switzerland, Canada, the United States and the United Kingdom, the sale of CBD products for oral or sublingual use is permitted and regulated. In these territories, it is common to find CBD oils marketed as dietary supplements.

The marketing and permitted use of CBD products depends on the country and the legal category of the product. It is always recommended to check the regulations in force in the country of residence before purchasing any CBD product. For more information on the regulation in Spain, see our article on the regulation of CBD and hemp.

Cannactiva CBD oils are intended for external use. Cannactiva does not market or promote the oral or sublingual use of its products.

Sublingual CBD Frequently Asked Questions (FAQ)

What is sublingual CBD?

Sublingual CBD is a form of cannabidiol administration that involves placing a few drops of CBD oil under the tongue for a short period of time. Through the sublingual mucosa, part of the CBD can be absorbed directly into the bloodstream. This route is authorized in some countries, but not in the entire European Union.

How long does it take for sublingual CBD to take effect?

According to available research, the effects of sublingually administered CBD usually appear 30 to 45 minutes after administration. Peak blood concentration is reached approximately 1.5 to 2 hours. These times may vary from person to person.

What is the difference between sublingual CBD and oral CBD?

The main difference is the route of absorption. In the sublingual route, part of the CBD is absorbed through the buccal mucosa and reaches the bloodstream without first passing through the liver. In the oral route (ingestion), CBD travels through the digestive system and liver before reaching the blood, which may reduce its bioavailability.

Is it legal to use CBD oil sublingually?

The legality of sublingual use of CBD depends on the country. In most countries of the European Union, including Spain, CBD oils are marketed for external (topical) use. Countries such as Switzerland, Canada or the United States do allow the sale of CBD products for internal use.

Does sublingual CBD have side effects?

CBD is a compound considered safe. Side effects are rare and usually mild: dry mouth, mild drowsiness or temporary decrease in appetite. These effects have been observed mainly at high doses. It is recommended to consult a health professional before using CBD.

CBD Oils in Cannactiva

The sublingual route is one of the most studied forms of CBD administration in scientific research. The information contained in this article is for informational purposes only and does not constitute a recommendation for the use of Cannactiva products.

If you are interested in CBD oils for external use, you can consult Cannactiva’s catalog:

Note: This is an informational article and is not intended to prevent, diagnose or treat any disease. Its content can complement, but should never replace, the diagnosis or treatment of any disease or symptom. Cannactiva products are not medicines and are intended for external use. There may be new relevant scientific evidence since the date of publication. Consult with your physician before using CBD. The therapeutic approach must always be personalized and will depend on the professional assessment.