High Caution

Chamomile has preliminary anxiety research and traditional relaxation use, but evidence is not conclusive and allergy, pregnancy, sedative, and anticoagulant contexts matter. | Passionflower has limited anxiety research and traditional relaxation use; sedation and pregnancy cautions should be reviewed before concentrated products. | Valerian is used for sleep and relaxation, but NCCIH says evidence is insufficient for anxiety and sedation cautions matter. | Caffeine can worsen anxiety, panic, sleep disruption, or heart-racing symptoms in sensitive people or at higher intakes. | Ashwagandha has stress/anxiety study context, but thyroid, pregnancy, autoimmune, liver, sedative, and medication cautions are important.

10 linked items - Persistent anxiety, panic attacks, trauma symptoms, severe insomnia, substance use, medication changes, pregnancy, or thoughts of self-harm need qualified care. Seek urgent or emergency help for thoughts of self-harm, feeling unsafe, severe panic with chest pain or fainting, psychosis, mania, or major behavior changes. Supplements can interact with medicines and should not replace therapy, medication, or urgent mental-health support.

National Center for Complementary and Integrative Health - Acquired 2026-08-03 - Traditional / Safety Reference

National Center for Complementary and Integrative Health - Acquired 2026-08-03 - Traditional / Safety Reference

pregnancy/breastfeeding | thyroid disease | autoimmune disease | liver disease | sedatives

Herbs & Botanicals - Evidence: promising

pregnancy/breastfeeding | diabetes medications | blood pressure medications | antibiotics | infants

Herbs & Botanicals - Evidence: promising

No established toxicity pattern | High-dose supplements can interfere with some lab tests, including thyroid and cardiac troponin tests | Tell clinicians about biotin use before urgent blood tests, especially thyroid or heart-related testing.

vitamin - High-dose biotin can interfere with lab tests, including thyroid and cardiac tests.

liver disease | pregnancy/breastfeeding | hormone-sensitive conditions | product quality

Herbs & Botanicals - Evidence: emerging

Fish-oil omega-3s may have small blood-pressure effects in studies, but dose, bleeding risk, medication use, and product quality matter. | Garlic preparations may modestly lower blood pressure in some hypertension studies, but evidence quality and bleeding-risk interactions matter. | Caffeine can raise blood pressure or trigger palpitations in some people, depending on dose, tolerance, timing, and health status. | Glycyrrhizin-containing licorice can raise blood pressure, lower potassium, and contribute to heart rhythm or kidney concerns. | Green tea extract is studied in cardiometabolic contexts, but concentrated extracts can carry liver-safety and caffeine-related cautions.

6 linked items - High blood pressure should be monitored and managed with qualified care. Supplements should not replace prescribed medication, and several products can affect blood pressure, potassium, bleeding risk, or medication response.

pregnancy/breastfeeding | sleep | anxiety | heart rhythm | blood pressure

Sports & Performance - Evidence: established use

Constipation | Kidney stones | High blood calcium | Confusion or weakness in hypercalcemia | Reduced absorption of iron or zinc when intakes are high

mineral - Calcium supplements need caution with kidney stones, kidney disease, high calcium levels, and some medications.

Nausea or vomiting | Abdominal pain | Liver injury | Neurologic symptoms in copper overload states | Seek urgent care for severe abdominal pain, vomiting, yellowing skin, confusion, or suspected copper overdose.

trace_mineral - Copper excess can be harmful, especially with liver disease or copper metabolism disorders.

liver disease | caffeine sensitivity

Additional Bioactives - Evidence: promising

Can mask vitamin B12 deficiency | May allow neurologic damage from untreated B12 deficiency to progress | Possible sleep or digestive effects at high supplemental intakes | Seek medical evaluation for anemia symptoms or neurologic symptoms because high folic acid intake can hide vitamin B12 deficiency.

vitamin - High folic acid intake can mask vitamin B12 deficiency, so anemia or neurologic symptoms need medical evaluation.

Thyroid dysfunction | Goiter | Hyperthyroid or hypothyroid symptoms in susceptible people | Thyroiditis risk with high intakes | Seek medical care for neck swelling, severe palpitations, chest pain, marked fatigue, or new thyroid symptoms after high iodine intake.

trace_mineral - Iodine can worsen thyroid problems when intake is too low or too high.

NIH Office of Dietary Supplements - Acquired 2026-08-03 - Official Reference

Nausea or vomiting | Constipation or abdominal pain | Organ damage with iron overload | Acute poisoning risk in children | Suspected iron poisoning, especially in children, is urgent. Contact poison control or emergency services immediately.

mineral - Iron supplements should usually be guided by labs; accidental overdose in children is an emergency.

liver disease | alcohol | sedatives | driving | pregnancy/breastfeeding

Herbs & Botanicals - Evidence: promising

blood pressure | low potassium | heart disease | kidney disease | pregnancy/breastfeeding

Herbs & Botanicals - Evidence: traditional use

Diarrhea | Nausea or abdominal cramping | Low blood pressure | Lethargy or confusion | Irregular heartbeat risk with very high supplemental doses or kidney disease

mineral - Supplemental magnesium can accumulate in kidney disease and can interact with several medications.

Neurologic symptoms | Movement problems resembling parkinsonism | Higher risk with occupational exposure or impaired liver clearance | Seek medical evaluation for new tremor, movement problems, or neurologic symptoms after high exposure.

trace_mineral - Excess manganese is mainly a neurologic concern and risk rises with impaired liver clearance or high exposure.

National Center for Complementary and Integrative Health - Acquired 2026-08-03 - Traditional / Safety Reference

Skin flushing or itching | Nausea | Liver injury risk with high-dose nicotinic acid | Higher blood sugar or uric acid in susceptible people | Seek care for severe flushing with dizziness, chest pain, yellowing skin, dark urine, or signs of liver injury after high-dose niacin.

vitamin - High-dose niacin is medication-like and can affect the liver, blood sugar, uric acid, and flushing reactions.

Omega-3 supplements are studied in PCOS marker contexts, including insulin-resistance and lipid markers, but high-dose use needs bleeding-risk review. | Chromium is studied in glucose and PCOS marker contexts, but evidence is not a reason for unsupervised high-dose use. | Vitamin D status is often discussed in PCOS, but supplementation should follow ordinary DRI/UL, testing, and safety context. | Berberine has glucose and lipid marker evidence but carries medication, pregnancy, breastfeeding, antibiotic, infant, and transplant cautions. | Cinnamon is studied for glucose markers and PCOS-related metabolic contexts, but species, coumarin, liver disease, anticoagulants, and diabetes medicines matter.

6 linked items - PCOS can involve menstrual irregularity, fertility concerns, metabolic risk, acne/hair growth changes, and mental-health burden. Supplements should not replace diagnosis, cycle evaluation, fertility care, or diabetes/cardiovascular-risk screening.

Low calcium balance concern | Soft tissue calcification risk in kidney disease | Higher cardiovascular and bone concern when kidney function is impaired | People with kidney disease should seek clinician guidance for high phosphate levels, weakness, bone pain, or calcification concerns.

mineral - Phosphorus and phosphate intake are especially important in kidney disease.

Muscle weakness | Numbness or tingling | Nausea | Dangerous heart rhythm changes, especially with kidney disease or certain medications | High or low potassium can cause dangerous heart rhythm changes. Seek urgent care for chest pain, fainting, severe weakness, or palpitations.

macromineral - Potassium supplements and salt substitutes can be dangerous with kidney disease or medications that raise potassium.

Hair loss | Brittle nails | Garlic breath odor | Nausea or diarrhea | Skin rash

trace_mineral - Selenium has a narrow safety margin compared with many nutrients, and excess can cause hair, nail, digestive, and neurologic symptoms.

National Center for Complementary and Integrative Health - Acquired 2026-08-03 - Traditional / Safety Reference

High blood pressure risk | Fluid retention | Thirst | Higher cardiovascular and kidney strain when chronically excessive | Seek urgent care for confusion, seizures, severe headache, or suspected severe dehydration or hyponatremia.

macromineral - Sodium intake is clinically important for blood pressure, kidney disease, heart failure, dehydration, and hyponatremia risk.

Hyponatremia | Headache | Nausea | Confusion | Seizures in severe water intoxication

macronutrient - Both dehydration and overhydration can become urgent when confusion, fainting, seizures, or severe weakness appear.

blood thinners | bleeding risk | surgery | gallbladder disease | pregnancy/breastfeeding

Antioxidants & Phytonutrients - Evidence: promising

Headache or dizziness | Nausea | Blurred vision | Bone pain | Liver injury risk

vitamin - High preformed vitamin A intake can be toxic and is especially important to avoid during pregnancy unless clinician-guided.

Peripheral neuropathy | Numbness or tingling | Loss of coordination | Skin lesions | Photosensitivity

vitamin - Long-term high-dose vitamin B6 can cause neuropathy symptoms.

High blood calcium | Nausea or vomiting | Weakness | Frequent urination or dehydration | Kidney stones or kidney injury risk

vitamin - High-dose vitamin D can raise calcium levels and should be monitored when used above routine intake ranges.

Increased bleeding tendency | Easy bruising | Higher concern with blood thinners | Possible hemorrhagic stroke risk at high supplemental intakes | Seek medical care promptly for unusual bleeding, black stools, severe bruising, or bleeding while using anticoagulant medication.

vitamin - Supplemental vitamin E needs caution with blood thinners or bleeding-risk conditions.

No common food-based toxicity pattern is established | Supplemental forms can interfere with anticoagulant management | Seek care for unexplained or heavy bleeding, especially in newborns or people using anticoagulant medication.

vitamin - Vitamin K intake should be kept consistent when using warfarin or other anticoagulant plans.

Nausea or vomiting | Loss of appetite | Copper deficiency | Anemia or low immune function from copper depletion | Lower HDL cholesterol at high intakes

mineral - Long-term high-dose zinc can cause copper deficiency and related anemia or neurologic concerns.