Yes. Some supplements can cause dizziness, either as a direct side effect or because they interact with medicines or other supplements. Dizziness can also have many causes unrelated to supplements, so the timing of symptoms, the ingredients you are taking and any other medicines you use all matter.
If dizziness started after you began a new supplement, changed products or added another medicine, do not assume the supplement is definitely responsible. Keep a record of what you are taking and discuss the symptoms with a doctor or pharmacist. The Supplement Side Effects hub can also help you find information about specific ingredients and products.
Seek urgent medical help if dizziness occurs with trouble breathing, chest pain, swelling of the face or throat, fainting, seizures, severe bleeding, a severe rash, suicidal thoughts, suspected overdose or rapidly worsening symptoms. Serious reactions to supplements can include breathing problems, swelling, fainting and cardiovascular symptoms.
How supplements Causing Dizziness can be linked to medicines or supplements
A supplement does not have to be a prescription medicine to produce side effects. Supplement ingredients can have biological effects, and some can interact with prescription medicines, over-the-counter products or other supplements. These interactions may increase or reduce the effects of medicines and, in some cases, increase the risk of adverse effects.
Dizziness itself can mean different things. Some people describe feeling light-headed or as if they may faint. Others feel unsteady, off balance or as though they or their surroundings are spinning. Because these sensations have many possible causes, dizziness alone cannot tell you which product or medical condition is responsible.
Possible supplement categories
Dizziness has been documented with some specific supplement ingredients.
For example, the US National Center for Complementary and Integrative Health (NCCIH) lists dizziness among the common side effects of ginkgo leaf extract. NCCIH also lists dizziness among possible side effects of St John’s wort, an herbal product that can interact with numerous medicines.
Melatonin can also cause dizziness in some people. NHS guidance specifically advises people experiencing dizziness after taking melatonin to avoid activities such as driving or using machinery while affected.
These examples do not mean that everyone taking these products will become dizzy, or that they are the only supplements capable of causing the symptom. The safety profile depends on the ingredient, formulation, amount used, other medicines and supplements, and the individual taking it.
Multi-ingredient products can be particularly difficult to assess because there may be several active ingredients to consider. A healthcare professional will usually need the exact product name and ingredient list rather than simply being told that you are taking “a vitamin” or “a herbal supplement”.
Timing clues
Timing can provide useful information even though it cannot prove that a supplement caused the dizziness.
Make a note if dizziness:
- began soon after starting a new supplement;
- appeared after changing the amount or formulation;
- started after switching brands;
- occurs repeatedly after taking a particular product;
- began after adding a prescription or over-the-counter medicine;
- appeared after combining two or more supplements; or
- improves and then repeatedly returns in a pattern linked to when products are taken.
Because supplement-medicine interactions are possible, tell your doctor or pharmacist about all medicines and supplements you use rather than considering each product separately.
Medicines and product categories that may be associated with this symptom
When investigating dizziness, it is useful to separate the products you take into groups rather than assuming one supplement is responsible.
Sleep and relaxation products
Products taken for sleep or relaxation may contain ingredients that affect alertness. Melatonin, for example, can cause dizziness as well as sleepiness in some people. If you feel dizzy or drowsy, activities that require concentration and balance, including driving, may be unsafe until the symptoms have passed.
Herbal supplements
Herbal does not automatically mean side-effect free. Ginkgo and St John’s wort are examples of herbal ingredients for which dizziness has been reported. St John’s wort is also notable because it can interact with a wide range of medicines.
Supplements taken alongside medicines
Sometimes the important issue is not the supplement by itself but the combination of products being taken.
Supplement ingredients can alter the effects of prescription and over-the-counter medicines. That is why your pharmacist or doctor should know about vitamins, minerals, herbal products and other complementary products alongside your regular medicines.
If you are also researching prescription or pharmacy products, see the medication side effects guide.
Multi-ingredient supplements
Weight-management, energy, sleep, sports and general wellness products may contain several active ingredients. If dizziness appears after using one of these products, keep the packaging or photograph the complete label. The ingredient names and quantities may be more useful to a healthcare professional than the marketing name alone.
Do not assume that an ingredient is harmless simply because it is described as “natural”. Authoritative supplement-safety guidance notes that complementary products can have side effects and can interact with medicines.
How to choose the right next guide
If you know the exact supplement involved, start with information about that ingredient or product.
If the main problem is the symptom rather than a known product, the side effect symptoms A-Z guide can help you explore other symptom-led information.
For persistent or unexplained dizziness, however, online information should not replace an assessment by a healthcare professional. Dizziness can have causes that have nothing to do with supplements.
Red flags: when this symptom may need urgent medical attention
Most episodes of dizziness are not necessarily a medical emergency, but the symptoms occurring with the dizzinessmatter.
Get urgent medical help if dizziness is accompanied by:
- trouble breathing or shortness of breath;
- swelling of the face, lips, tongue or throat;
- chest pain;
- fainting or loss of consciousness;
- seizures;
- severe or unusual bleeding;
- a severe or rapidly spreading rash;
- severe confusion or a major change in alertness;
- suicidal thoughts or dangerous changes in behaviour;
- suspected overdose; or
- symptoms that are severe or rapidly worsening.
Serious supplement reactions can involve swelling, wheezing, low blood pressure, fainting, chest pain, breathing difficulty, abnormal bleeding and other potentially dangerous symptoms.
Sudden dizziness can also sometimes occur as part of a medical problem unrelated to supplements. Do not delay urgent care because you assume a vitamin, herb or other product is the explanation.
Possible medicine categories
If you take prescription or over-the-counter medicines as well as supplements, tell the healthcare professional treating you about all of them.
A reaction may involve:
- the supplement itself;
- a medicine;
- an interaction between the two;
- more than one supplement; or
- a completely unrelated medical cause.
This is one reason it is unsafe to diagnose the cause from a symptom alone.
Timing clues
When seeking urgent care, mention whether the symptoms began soon after taking a product and whether anything else occurred at the same time, such as swelling, breathing difficulty, vomiting, rash, fainting or confusion.
If possible, take the supplement container, medicine packaging or a clear photograph of the labels with you.
What to track before speaking to a doctor or pharmacist
A clear timeline can make it easier for a healthcare professional to investigate possible supplements causing dizziness.
Record:
- the name and brand of every supplement you take;
- the complete ingredient list;
- the amount listed on the product label;
- prescription and over-the-counter medicines you use;
- when you started each product;
- whether anything recently changed;
- when the dizziness first appeared;
- when each episode happens;
- approximately how long episodes last;
- whether you feel light-headed, unsteady or as if the room is spinning;
- other symptoms occurring at the same time;
- whether dizziness is interfering with walking, driving, working or normal activities; and
- any relevant medical conditions, pregnancy or breastfeeding.
Do not forget products used only occasionally. Herbal remedies, sleep products, energy products, powders, traditional or complementary products and over-the-counter medicines may all be relevant when checking for interactions. NCCIH specifically recommends discussing supplements with healthcare providers because interactions with medicines and other supplements are possible.
Red-flag symptoms
Record any associated symptoms, but do not spend time documenting them before seeking care if you have an emergency warning sign.
Trouble breathing, facial or throat swelling, chest pain, fainting, seizures, severe bleeding or a rapidly worsening reaction requires prompt medical attention.
When to contact a doctor, pharmacist or emergency service
Speak to a doctor or pharmacist when dizziness:
- started after introducing or changing a supplement;
- keeps returning;
- is becoming more troublesome;
- is affecting normal activities;
- occurs while you are taking several medicines or supplements; or
- is accompanied by other unusual symptoms.
Seek emergency medical help for serious warning signs rather than waiting for a routine appointment.
What not to do without medical advice
Do not assume the supplement is definitely responsible
A new symptom appearing after a supplement was started is an important clue, but timing alone does not prove causation. Dizziness has many possible explanations.
Do not abruptly change prescribed treatment on your own
If you suspect that a supplement is interacting with a prescribed medicine, speak to the doctor or pharmacist managing your treatment. Do not stop or change the dose of prescribed medication based only on information found online.
Do not add another product to “cancel out” the dizziness
Adding another supplement or over-the-counter medicine can make the situation more complicated and may introduce additional interactions.
Do not ignore the full ingredient list
Two products marketed for similar purposes can contain very different ingredients. Likewise, products with different names may contain the same active ingredient.
Bring the actual packaging or ingredient list when speaking to a healthcare professional.
Do not dismiss a serious reaction because the product is natural
Natural products can still have biological effects and interactions. Supplement safety depends on the ingredient, product and individual circumstances.
Related side-effect guides and reporting options in South Africa
If you think a supplement or medicine may be linked to dizziness, the safest approach is to identify the exact product, record the timing of the reaction and discuss it with a doctor or pharmacist.
For broader information about individual supplement reactions, visit the Supplement Side Effects hub. If you are trying to investigate dizziness or another symptom rather than a specific product, use the side effect symptoms A-Z guide.
What information to record
Before reporting or discussing a suspected reaction, keep:
- the product name;
- manufacturer or brand where available;
- ingredient list;
- when the product was taken;
- when symptoms began;
- other medicines and supplements being used;
- a description of what happened; and
- whether medical treatment was required.
A report of a suspected reaction does not necessarily prove that the product caused it. Reporting contributes information that regulators can use when monitoring health-product safety.
Where reporting fits into medicine safety
In South Africa, the South African Health Products Regulatory Authority (SAHPRA) operates health-product vigilance systems for suspected adverse events. SAHPRA states that consumers, healthcare professionals and other parties can report adverse events, including through its electronic reporting channels.
See the guide to report side effects in South Africa for the appropriate reporting route and information to prepare.
Reporting is not a substitute for medical care. If you have serious or rapidly worsening symptoms, get medical help first.
Frequently asked questions
Is dizziness a common side effect of supplements?
There is no single answer for supplements as a group. The likelihood depends on the ingredient and product. Dizziness is specifically reported with some ingredients, including ginkgo, St John’s wort and melatonin, but this does not mean it occurs with every supplement or every person who takes them.
How long can supplement-related dizziness last?
It depends on the product, the individual and the reason for the dizziness. Without knowing the cause, it is not possible to predict how long it will last. Dizziness that persists, repeatedly returns, becomes severe or is accompanied by other concerning symptoms should be discussed with a healthcare professional.
Should I stop my medicine if I feel dizzy?
Do not stop or change prescribed medication without guidance from your doctor or pharmacist. If dizziness started after adding a supplement, give your healthcare professional the complete list of supplements and medicines you take so they can assess possible side effects and interactions.
If dizziness occurs with serious symptoms such as trouble breathing, facial or throat swelling, chest pain, fainting or seizures, seek urgent medical attention.
When should I seek help?
Contact a doctor or pharmacist if dizziness is persistent, keeps returning, is getting worse or started after a change in medicines or supplements.
Seek urgent medical help for dizziness accompanied by breathing problems, chest pain, swelling of the face or throat, fainting, seizures, severe bleeding, severe confusion or another rapidly worsening reaction.
What are the most important things to know about supplements causing dizziness?
Some supplements can cause dizziness directly, while supplement-medicine interactions may also contribute to unwanted effects. Keep the product packaging, record when symptoms occur and tell your doctor or pharmacist about every supplement and medicine you take.
Do not diagnose the cause yourself or change prescribed treatment without medical guidance. Serious or rapidly worsening symptoms require urgent medical attention.
This article provides general medicine and supplement safety information and is not a diagnosis or a substitute for advice from a doctor, pharmacist or other qualified healthcare professional.