Supergreen Tonik Review 2026: Legit or Overhyped?

Possible side effects

• Stomach upset, loose stools, nausea, and drowsiness are listed as common side effects, and ODS calls them mild.
• NCCIH says some people may get drowsiness, stomach upset, diarrhea, and vomiting.
• Increased heart rate variability has been reported.

Serious risks

• There are a few reports of more serious side effects, including effects on liver function.
• In reported liver injury cases, people's conditions improved over time after they stopped the supplement, and some also received medical treatment.
• NCCIH describes liver injury cases linked to ashwagandha supplements and calls them rare.
• Three case reports describe thyrotoxicosis in women taking ashwagandha extract.
• In all three thyrotoxicosis cases, stopping ashwagandha resolved the symptoms.

Avoid or ask a doctor first if

• Some experts advise pregnant women not to use ashwagandha, because some reports suggest it could cause spontaneous abortion.
• NCCIH says to avoid ashwagandha during pregnancy and not to use it while breastfeeding.
• NCCIH does not recommend it before surgery or for people with autoimmune or thyroid disorders.
• People with hormone-sensitive prostate cancer should avoid it because it may raise testosterone.

Medication interactions

• Ashwagandha might interact with thyroid hormone medications.
• It might also interact with antidiabetes drugs, antihypertensives, immunosuppressants, and sedatives.
• NCCIH lists diabetes, high blood pressure, immunosuppressant, sedative, anti-seizure, and thyroid hormone medications.

Possible side effects

• Side effects may include dizziness, headache, insomnia, and either dry mouth or excessive saliva production.
• Rhodiola is possibly safe for up to 12 weeks.

Avoid or ask a doctor first if

• Little is known about safety during pregnancy or breastfeeding.
• People who have or may have depression, or have a family member who may, should consult a health care provider.

Medication interactions

• Interactions between rhodiola and losartan, a blood pressure drug, have been reported.
• People taking any medicine should talk with a health care provider before using an herbal product, since some herbs and medicines interact in harmful ways.

Possible side effects

• Topical dandelion may cause an allergic reaction in people with atopic dermatitis (eczema), according to some evidence.
• Evidence is conflicting on whether dandelion causes an allergic reaction in people sensitive to related plants.

Avoid or ask a doctor first if

• Little is known about safety during pregnancy or breastfeeding when dandelion is used in amounts greater than those in foods.
• Topical dandelion may cause an allergic reaction in people with atopic dermatitis (eczema).

Medication interactions

• Dandelion might interact with antidiabetes, anticoagulant, antiplatelet, and water pill drugs, among others. The source says this is based on theoretical reasons.
• People who take any medicine or supplements are told to talk with their health care provider before using dandelion.

Possible side effects

• Raw or unripe elderberries and other elder tree parts can cause nausea, vomiting, and severe diarrhea.

Serious risks

• Large quantities of the toxin in raw or unripe elderberries and other elder parts may cause serious illness.

Avoid or ask a doctor first if

• Little is known about whether elderberry is safe for health purposes during pregnancy or breastfeeding.

Medication interactions

• People who take any type of medicine are told to talk with their health care provider before using elderberry or other herbal products, because some herbs and medicines interact in harmful ways.

Possible side effects

• The most common complaints are diarrhea, nausea, abdominal cramps, and other digestive upset.

Serious risks

• High intakes may raise urinary oxalate and uric acid, which could contribute to kidney stones, especially in people with renal disorders.
• The best evidence that vitamin C contributes to kidney stones is in patients who already have hyperoxaluria.
• In people with hereditary hemochromatosis, long-term high doses could worsen iron overload and cause tissue damage.
• A few in vitro studies suggested that supplemental oral vitamin C, acting as a pro-oxidant, could cause chromosomal or DNA damage and possibly contribute to cancer.
• In postmenopausal women with diabetes in the Iowa Women's Health Study, supplemental vitamin C of at least 300 mg/day was significantly associated with a higher risk of dying from CVD.

Avoid or ask a doctor first if

• People with hereditary hemochromatosis face a concern about iron overload with chronic high doses.
• The upper limits do not apply to people receiving vitamin C as medical treatment, who should be under a physician's care.
• Infants should get vitamin C only from formula and food.

Medication interactions

• Vitamin C supplements may interact with radiation therapy and with medications, including chemotherapy drugs and statins.
• People taking these medications regularly should talk with their health care providers about vitamin C intake.

Possible side effects

• High blood calcium from vitamin D toxicity can lead to nausea, vomiting, muscle weakness, and other symptoms.

Serious risks

• Toxicity can cause high blood and urine calcium. In extreme cases it may lead to kidney failure, soft tissue calcification, heart rhythm problems, and death.
• Toxicity is almost always caused by taking too much vitamin D through supplements.

Avoid or ask a doctor first if

• The source says people on regular medications should talk with their health care providers about vitamin D intake and status.

Medication interactions

• Vitamin D supplements may interact with orlistat, statins, steroids, and thiazide diuretics.
• Taking calcium supplements with vitamin D supplements may raise the risk of certain adverse effects.

Serious risks

• The Food and Nutrition Board reported no adverse effects from vitamin K in food or supplements in humans or animals.

Avoid or ask a doctor first if

• People taking medications regularly should talk with their health care providers about their vitamin K status.

Medication interactions

• Vitamin K can interact with warfarin and other anticoagulants.
• Antibiotics, bile acid sequestrants, and orlistat can have adverse effects on vitamin K levels.

Serious risks

• No adverse effects have been reported from high thiamin intakes, but the FNB noted that excessive intakes could still have adverse effects.

Avoid or ask a doctor first if

• People who take certain medications regularly should talk with their health care providers about their thiamin status.

Medication interactions

• Thiamin isn't known to interact with any medications, but certain medications can have an adverse effect on thiamin levels.

Serious risks

• Food intakes many times the RDA show no observable toxicity; the source suggests limited solubility and absorption may explain this.
• Limited data on adverse effects don't mean high intakes are harmless, and the FNB urges caution with excessive amounts.

Medication interactions

• Riboflavin is not known to have clinically relevant interactions with medications.

Serious risks

• The Food and Nutrition Board set no upper limit for B12 because its potential for toxicity is low.

Avoid or ask a doctor first if

• People who regularly take certain medications are told to talk with their health care providers about their B12 status.

Medication interactions

• B12 supplements may interact with some medications. Gastric acid inhibitors and metformin may affect B12 levels.
• Several types of medications might adversely affect B12 levels.

Serious risks

• High biotin intakes, possibly even intakes above the AI, may pose a health risk tied to lab testing.
• Biotin beyond recommended intakes can cause clinically significant falsely high or falsely low lab results, depending on the test.
• In a small study of six healthy adults taking 10 mg/day for 1 week, biotin falsely lowered N-terminal pro-brain natriuretic peptide, which could result in a failure to identify congestive heart failure. Thyroid stimulating hormone was also falsely lowered.
• Case reports describe findings falsely indicating Graves' disease and severe hyperthyroidism in patients taking 10–300 mg biotin per day.
• A single 10 mg dose of biotin has interfered with thyroid function tests given within 24 hours.
• Per FDA, a patient with a high intake of supplemental biotin died after a troponin test gave a falsely low result because of biotin interference.

Medication interactions

• Biotin can interact with certain medications, and some medications can have an adverse effect on biotin levels.

Possible side effects

• Some people taking large doses of pantothenic acid supplements develop mild diarrhea and gastrointestinal distress. The cause is not known.

Serious risks

• The FNB found no reports of pantothenic acid toxicity in humans at high intakes.

Medication interactions

• Pantothenic acid is not known to have clinically relevant interactions with medications.

Possible side effects

• High iodine intakes can cause goiter, elevated TSH levels, and hypothyroidism, some of the same symptoms as iodine deficiency.

Serious risks

• Iodine-induced hyperthyroidism can result from high iodine intakes, including when iodine is given to treat iodine deficiency.
• Studies have shown that excessive iodine intakes cause thyroiditis and thyroid papillary cancer.
• Acute iodine poisoning is rare and is usually caused by doses of many grams. Symptoms include burning of the mouth, throat, and stomach, fever, abdominal pain, nausea, vomiting, diarrhea, weak pulse, and coma.
• Long-term intakes above the UL increase the risk of adverse health effects.

Avoid or ask a doctor first if

• People with autoimmune thyroid disease or iodine deficiency may have adverse effects at iodine intakes considered safe for the general population.
• The ULs do not apply to people receiving iodine for medical treatment, who should be under a physician's care.

Medication interactions

• Iodine supplements have the potential to interact with several types of medications. People taking these medications on a regular basis should discuss their iodine intakes with their health care providers.

Possible side effects

• High zinc intakes can cause nausea, dizziness, headaches, gastric distress, vomiting, and loss of appetite.

Serious risks

• Doses of 50 mg or more taken for weeks can interfere with copper absorption, reduce immune function, and lower HDL cholesterol.
• Very high supplemental doses (142 mg/day) might interfere with magnesium absorption and disrupt magnesium balance.
• According to a few reports, overuse of zinc-containing denture adhesive creams can lead to neurological symptoms and anemia.

Avoid or ask a doctor first if

• The upper limits don't apply to people receiving zinc for medical treatment, who should be under a physician's care.
• Zinc-free denture adhesive formulations are available to prevent the effects linked to zinc-containing creams.

Medication interactions

• Zinc may interact with quinolone antibiotics, tetracycline antibiotics, and penicillamine.
• Some diuretics can lower serum zinc by increasing zinc excretion in urine.
• People taking medications regularly should discuss their zinc status with their health care providers.

Possible side effects

• Early signs of too much selenium are a garlic odor on the breath and a metallic taste in the mouth.
• Hair loss and nail brittleness or loss are the most common clinical signs of chronically high selenium intake.
• Other signs of chronically high intake include skin rash, nausea, diarrhea, fatigue, irritability, and nervous system abnormalities.

Serious risks

• Acute selenium toxicity can cause severe gastrointestinal and neurological symptoms, respiratory distress syndrome, heart attack, kidney failure, cardiac failure, and, in rare cases, death.
• Acute toxicity has resulted from misformulated over-the-counter products containing very large amounts of selenium. In 2008, 201 people had severe adverse reactions to a liquid supplement with 200 times the labeled amount.
• Brazil nuts contain very high amounts of selenium and could cause selenium toxicity if eaten regularly.

Avoid or ask a doctor first if

• The upper limits do not apply to people taking selenium under a physician's care.
• People who take medications regularly should discuss their selenium status with their health care providers.

Medication interactions

• Selenium supplements may interact with medications, and some medications, such as cisplatin, can affect selenium levels in the body.

Possible side effects

• High copper exposure over time can cause gastrointestinal symptoms.

Serious risks

• Chronic exposure to high levels of copper can result in liver damage.
• Copper toxicity has been reported in people who drink water with high copper levels, for example from stagnant water in copper-containing pipes and fixtures.
• People with Wilson's disease can develop neurologic and liver damage that can result in cirrhosis.

Avoid or ask a doctor first if

• People with Wilson's disease have a high risk of copper toxicity.

Medication interactions

• Copper is not known to have any clinically relevant interactions with medications.

Serious risks

• Manganese toxicity mainly affects the central nervous system and can cause tremors, muscle spasms, tinnitus, hearing loss, and unsteadiness on one's feet.
• People who drink water with high manganese levels have also developed manganese toxicity.
• Workers such as welders and miners who chronically inhaled manganese dust have developed manganese toxicity.
• Toxicity signs and symptoms can progress to Parkinson's-like neuromotor impairments, including changes in gait and balance, tremor, and rigidity.

Avoid or ask a doctor first if

• People with chronic liver disease eliminate manganese less well in bile and are more susceptible to its neurotoxicity and other adverse effects of excess intake.
• Iron deficiency increases manganese absorption and can worsen symptoms of manganese toxicity.

Medication interactions

• Manganese is not known to have any clinically relevant interactions with medications.

Serious risks

• Isolated case reports link chromium supplements to several problems, including liver dysfunction and renal failure.
• The FNB said caution may be warranted because data are limited, and high intakes could have adverse effects.

Avoid or ask a doctor first if

• People with renal or liver disease might be susceptible to adverse effects from high chromium intakes.

Medication interactions

• Several types of medications have the potential to interact with chromium supplements.
• People taking medications regularly should talk with their health care providers about their chromium intakes.

Serious risks

• Acute molybdenum toxicity is rare but can occur with industrial mining and metalworking exposure.
• In one study of high dietary molybdenum intake in an area of Armenia, affected people had achy joints, gout-like symptoms, and abnormally high blood uric acid.

Avoid or ask a doctor first if

• Infants up to 12 months should get molybdenum only from breast milk, formula, and food.

Medication interactions

• The source says molybdenum has no known, clinically relevant, interactions with medications.

Possible side effects

• Oral garlic can cause breath and body odor, abdominal pain, flatulence, and nausea.
• Some people have allergic reactions to garlic.

Serious risks

• Garlic supplements may increase the risk of bleeding.
• Fresh raw garlic used topically can cause severe skin irritation and chemical burns.

Avoid or ask a doctor first if

• Garlic taken orally in amounts greater than those in foods may not be safe during pregnancy or breastfeeding.
• People having surgery are told to let their providers know they take garlic supplements.

Medication interactions

• If you take garlic supplements, tell your health care providers. This matters most before surgery or if you take medicines like anticoagulants or aspirin that may also affect bleeding.
• If you take anticoagulants, aspirin, or any other medicine, talk with your health care provider before using garlic or other herbal products, because some herbs and medicines interact in harmful ways.