Supplement · herbal
CBD
Quick read: Cannabidiol (CBD) is a prominent non-psychoactive phytocannabinoid derived primarily from the Cannabis sativa L.
Quick facts · Full Spectrum CBD Oil
- Dose
- 15 mg
- Per day
- 30 mg
- Timing
- Daily
- Course
- 60 days + break 30 days
- Strongest effect
- Anticonvulsant EffectVery highTheoretical
Scientific background
Form & dosage
- Single dose
- 15 mg
- Daily
- 30 mg
- Course
- 60 days
- Break
- 30 days
- Timing
- Daily
- Single dose
- 15 mg
- Daily
- 30 mg
- Course
- 60 days
- Break
- 30 days
- Timing
- Daily
- Single dose
- 25 mg
- Daily
- 50 mg
- Course
- 60 days
- Break
- 30 days
- Timing
- Daily
- Single dose
- 20 mg
- Daily
- 40 mg
- Course
- 60 days
- Break
- 30 days
- Timing
- Daily
- Single dose
- 10 mg
- Daily
- 30 mg
- Course
- 365 days
- Timing
- 3 times a day
- Single dose
- 5 mg
- Daily
- 20 mg
- Course
- 21 days
- Break
- 21 days
- Timing
- Individual
How we rate evidence
Probability — how likely the effect is to show up
- Very high
- High
- Medium
- Low
Evidence — where the data comes from
- Scientific Meta-analyses and randomized trials
- Clinical Clinical trials and practice
- Animal research Animal studies
- People reports User reports and anecdotes
- Theoretical Mechanistic reasoning, not yet tested
Effects
Very high probability(1)
- Anticonvulsant Effecthealththeoretical
CBD has demonstrated remarkable efficacy in reducing the frequency and severity of seizures in certain epilepsy syndromes, leading to its FDA approval for this specific use.
High probability(7)
- Anxiety Reductionpsychetheoretical
CBD interacts with the body's endocannabinoid system and serotonin receptors, promoting a sense of calm and reducing feelings of nervousness and worry, often felt relatively quickly after administration.
- Analgesic Effecthealththeoretical
CBD modulates pain pathways and reduces inflammation by interacting with cannabinoid and other receptors, providing relief from various types of discomfort, from muscle soreness to chronic pain.
- Inflammation Reductionhealththeoretical
CBD exhibits potent anti-inflammatory properties by modulating immune cell activity and reducing pro-inflammatory markers throughout the body, contributing to overall well-being and pain reduction with consistent use.
- Stress Resilience Improvementpsycheclinical
By modulating the body's stress response system and promoting a sense of calm, CBD can enhance one's ability to cope with daily stressors more effectively over time.
- Muscle Relaxationbodyclinical
CBD can help reduce muscle tension, stiffness, and spasms by influencing neuromuscular activity and promoting a general sense of relaxation, providing acute relief.
- Sleep Quality Improvementpsychetheoretical
By alleviating pain, anxiety, and promoting relaxation, CBD can help normalize sleep cycles, leading to more restorative and uninterrupted sleep over consistent use, though initial improvements can be observed sooner.
- Mood Improvementpsycheclinical
CBD's influence on serotonin pathways and its anxiolytic effects can contribute to an uplifted emotional state, helping to reduce feelings of low mood and promote overall well-being with consistent use.
Medium probability(4)
- Brain Fog Reductionmindpeople_reports
By reducing anxiety, improving sleep, and alleviating pain, CBD can indirectly lead to greater mental clarity, improved focus, and a reduction in the feeling of 'brain fog' for many users.
- Neuroprotective Effecthealthclinical
Through its antioxidant and anti-inflammatory actions, CBD helps protect brain cells from damage, supporting long-term neurological health, though this effect is not directly perceptible by users.
- Fatigue Reductionpsychepeople_reports
While not a direct stimulant, CBD can indirectly reduce fatigue by improving sleep quality and alleviating chronic pain or anxiety, though individual responses vary.
- Cardiovascular System Supporthealthclinical
Early research suggests CBD may support cardiovascular health through its anti-inflammatory and antioxidant properties, potentially contributing to healthy blood pressure and improved endothelial function over time, though users don't typically perceive this directly.
Side effects
Medium probability(8)
- Diarrheahealthclinical
Loose stools or diarrhea are among the most frequently reported GI side effects, often attributed to the carrier oils (like MCT oil) used in many CBD products, especially at higher intake levels.
- Drowsinessmindtheoretical
Many users experience mild to moderate drowsiness, especially at higher doses or during initial use, due to CBD's calming and sedative properties. It's often desired for sleep support but can be a side effect during daytime activities.
- Increased Concentration of Drugshealththeoretical
CBD can interact with liver enzymes (CYP450) responsible for metabolizing many drugs, potentially increasing their concentration in the bloodstream and leading to heightened effects or side effects of those medications.
- Increased Liver Loadhealthclinical
While rare, very high doses of CBD, especially over prolonged periods or in combination with certain medications, may increase the workload on the liver, potentially elevating liver enzymes in some sensitive individuals.
- Physical Fatiguepsycheclinical
A general feeling of tiredness or low energy can sometimes accompany CBD use, especially if experiencing drowsiness, making it feel harder to engage in physical activities.
- Dry Mouth (Xerostomia)bodytheoretical
A common side effect, often referred to as 'cottonmouth', where the salivary glands are affected, leading to a noticeable reduction in saliva production and a dry feeling in the mouth.
- Nauseahealthclinical
An unsettled stomach or mild nausea can sometimes occur, particularly with higher doses of CBD oil, possibly due to the carrier oil or individual sensitivity rather than the CBD itself.
- Digestive Discomforthealthclinical
Beyond specific issues like nausea or diarrhea, some users might experience general digestive upset, such as mild stomach cramps, bloating, or indigestion, often related to the carrier oil or individual gut sensitivity.
Low probability(9)
- Appetite Changes (Undesirable)psycheclinical
CBD can subtly influence appetite, leading to either a slight decrease or, less commonly, an increase in hunger for some users, reflecting its complex interaction with metabolic pathways.
- Headachehealthpeople_reports
Some users report mild headaches, which might be related to dehydration, the entourage effect of terpenes in full-spectrum products, or individual sensitivity, especially during initial use.
- Excessive Appetite Suppressionpsycheclinical
For some, particularly at higher therapeutic doses, CBD can lead to an undesirable reduction in appetite, potentially affecting overall caloric intake if not managed.
- Brain Fogmindpeople_reports
A subjective feeling of reduced mental clarity, making it difficult to concentrate or think clearly, often accompanying the sedative effects of CBD, especially at higher doses.
- Difficulty Concentratingmindclinical
Some users report a subtle decrease in focus or attention, often linked to the calming or sedative effects of CBD, especially at higher doses or when first starting use.
- Dizzinessmindclinical
A feeling of lightheadedness or unsteadiness can occur, particularly when CBD is taken in higher amounts or by individuals sensitive to its blood pressure-lowering effects.
- Blood Thinning (Bleeding Risk)healththeoretical
CBD may interact with certain medications like blood thinners (e.g., warfarin) by inhibiting liver enzymes, potentially increasing the risk of bleeding. This is particularly relevant for those on anticoagulant therapy.
- Hypotensionhealthclinical
CBD can cause a temporary, mild drop in blood pressure, leading to lightheadedness or dizziness, particularly when standing up quickly. This effect is more pronounced at higher doses.
- Taste Disorders (Dysgeusia)healthpeople_reports
Some CBD products, particularly full-spectrum oils, can have a strong, earthy, or sometimes unpleasant taste that can linger, leading to temporary alterations in taste perception or an undesirable aftertaste.
Low probability(4)
- Heartburn / Refluxhealthpeople_reports
Some users, particularly when taking oil-based CBD products on an empty stomach, might experience mild heartburn or a feeling of acid reflux. This is often related to the carrier oil content.
- Hepatotoxicity (Liver Damage)healthclinical
While extremely rare in typical use, high doses of CBD, especially when combined with other liver-metabolized drugs or in individuals with pre-existing liver conditions, carry a theoretical risk of liver damage. Monitoring liver enzymes is recommended in such cases.
- Vomitinghealthpeople_reports
While less common than nausea, vomiting can occur in sensitive individuals or at significantly high doses, often as a more severe manifestation of gastrointestinal upset.
- Skin Rash / Irritationbodypeople_reports
While rare, some individuals may experience localized skin irritation, redness, or a mild rash when using CBD topical creams, often due to sensitivity to other ingredients in the formulation rather than CBD itself.