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Side EffectsTheyaVue Side Effects and Interactions, With Numbers
Four daily amounts on the TheyaVue label are worth knowing before you start.
At two capsules a day you get zinc 32 mg, copper 2 mg, biotin 800 mcg and beta carotene 100 mcg RAE. Two can add up with other products, and biotin can change a blood test.
If you take other supplements, ask your doctor, and see who TheyaVue suits.
The label restricts itself to healthy adults aged eighteen and over. This page does not widen that and does not narrow it either.
Zinc: the TheyaVue figure that depends on what else you take
Sixteen milligrams a capsule, thirty-two a day. The tolerable upper intake level for adults is 40 mg a day from all sources, set by the Institute of Medicine on the basis of copper status rather than on any acute effect.
Thirty-two of forty leaves eight milligrams of headroom, and that is not much. A typical multivitamin carries 11 to 15 mg. An immune-support lozenge carries 10 to 25 mg. An AREDS-type eye formula carries 25 or 80 mg. Any one of those on top of this bottle crosses the level, and the crossing is invisible because nobody adds up labels.
What happens next is slow. Zinc and copper compete for the same intestinal transport, so sustained excess zinc depletes copper over months. The published case reports describe severe anaemia and neurological signs, in people taking far more than this for far longer, and the point of citing them is the mechanism rather than the severity.
This label pairs its zinc with copper, at 1 mg a capsule and 2 mg a day, which is exactly the amount the AREDS trial used alongside its own zinc. The ratio here is 16 to 1 against the trial's 40 to 1, so by the standard of the formula this whole category is built on, this one is copper-rich rather than copper-poor. A great many eye formulas name zinc and no copper at all. The Institute of Medicine chapter on copper is the reference for why that pairing exists.
Biotin: the TheyaVue figure to mention at a blood test
Four hundred micrograms a capsule, eight hundred a day, which reads on the bottle as 1,333 percent of a daily value and is 2,666 percent for a day. Biotin is water-soluble, there is no upper intake level for it, and at this level it does nothing to a person.
It does something to a laboratory. A large family of immunoassays uses the biotin-streptavidin bond as its capture chemistry, and circulating biotin competes with it. A 2020 evaluation found older-generation high-sensitivity troponin and thyroid-stimulating hormone assays affected at concentrations as low as 40.5 ng/mL, while a newer generation tolerated up to 1,200 ng/mL. Depending on the assay and the timing, the result can read falsely high or falsely low.
The practical step is one sentence: tell the clinic you take a supplement containing biotin. Troponin and thyroid tests are the two where it matters most, and both are tests where a wrong number has consequences.
Beta carotene: the TheyaVue figure a smoker should know
Fifty micrograms RAE a capsule, one hundred a day, listed as the vitamin A source. Five percent of a daily value per capsule.
Supplemental beta carotene has a specific history and it is worth stating properly. The CARET trial gave 30 mg of beta carotene with 25,000 IU of retinol to smokers and asbestos workers and was stopped early because the supplemented arm had more lung cancer. The ATBC trial gave 20 mg a day to 29,133 male smokers and found the same direction. The AREDS2 ten-year follow-up is why the modern AREDS formula carries no beta carotene at all.
Set the numbers beside each other. Those trials used 20 and 30 milligrams of beta carotene a day. This label gives 100 micrograms RAE a day, which converts to a fraction of a milligram of beta carotene on any conversion factor anyone uses. It is not the same order of magnitude and it is not the same exposure.
It is still worth knowing, for two reasons. The Institute of Medicine advises against supplemental beta carotene for the general population on exactly that evidence, and a person taking several supplements can accumulate it without noticing. Anyone who smokes or used to should know which form of vitamin A every bottle in the cupboard uses. MedlinePlus is a readable starting point, and the Institute of Medicine chapter on vitamin A is the technical one.
The rest of the TheyaVue panel, and the blend
Vitamin C, 200 mg a day
Well under the 2,000 mg upper level. The dose-limiting effect of vitamin C is osmotic diarrhoea and it appears several grams higher than this. The Institute of Medicine chapter sets out the level.
Vitamin E, 20 mg a day
As DL-alpha tocopheryl acetate, the synthetic form. The AREDS arm used 400 IU, which is 400 mg of the same acetate, so this is a twentieth of it. Vitamin E at high doses interacts with anticoagulants; at 20 mg a day it does not.
Selenium, 8 mcg a day
Seven percent of a daily value per capsule and nowhere near any limit. The 2023 EFSA opinion and the Institute of Medicine chapter both set upper levels many times this figure.
The B vitamins, 8 to 40 mg a day
B1, B2, B3 and B12 at multiples of a daily value, which is normal for water-soluble vitamins and carries no risk at these amounts. Niacin can flush at doses in the hundreds of milligrams; 40 mg a day does not.
Calcium, magnesium and chromium
Fifty milligrams, forty milligrams and 3.6 micrograms a day, which are two to seven percent of a daily value each. At those levels they are formulation rather than dose and this desk does not attach any claim to them.
Alpha lipoic acid, amount unknown
The one blend ingredient with a real interaction to flag. Alpha lipoic acid can lower blood glucose, and the 2025 review of its clinical record documents that alongside everything else it has been tried for. Anyone taking a medication that already lowers glucose should know it is in here. How much is in here is inside the blend.
Who should not take TheyaVue at all
- Anyone under 18. The label says healthy adults and the trials behind these ingredients enrolled adults.
- Anyone pregnant or nursing. Vitamin A in any form is a specific question in pregnancy and the answer belongs to a clinician who knows the whole picture.
- Anyone already on an AREDS-type formula, unless the zinc has been added up.
- Anyone taking a prescribed zinc supplement for a diagnosed deficiency, for the same reason.
- Anyone whose sight has changed recently, until they have had an examination. A dilated eye exam finds the things a capsule has nothing to do with.
Stop taking it and ring the order desk on +1 (315) 724-2018. The seller's page states it has never had a report of a side effect, which is not a claim this desk repeats and not a reason to stay quiet. A refund inside sixty days does not require a reason, and the refund policy sets out the five steps.
Who publishes this TheyaVue website?
- Chew EY, Clemons TE, Agron E, et al. Long-term outcomes of adding lutein/zeaxanthin and omega-3 fatty acids to the AREDS supplements on age-related macular degeneration progression: AREDS2 report 28. JAMA Ophthalmol. 2022;140(7):692-698. PMID 35653117. https://pubmed.ncbi.nlm.nih.gov/35653117/
- Carnib BL, Souza EV, Floresta LRS, et al. Therapeutic applications of alpha-lipoic acid: a review of clinical and preclinical evidence (1998-2024). Biomed Pharmacother. 2025;191:118480. PMID 40834747. https://pubmed.ncbi.nlm.nih.gov/40834747/
- Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8. Arch Ophthalmol. 2001;119(10):1417-1436. PMID 11594942. https://pubmed.ncbi.nlm.nih.gov/11594942/
- Magham K, Han J, Eilbert W. Severe copper deficiency anemia caused by zinc supplement use. Am J Emerg Med. 2023;72:222.e1-222.e2. PMID 37640593. https://pubmed.ncbi.nlm.nih.gov/37640593/
- Institute of Medicine (US) Panel on Micronutrients. Zinc. In: Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington DC: National Academies Press; 2001. https://www.ncbi.nlm.nih.gov/books/NBK222317/
- Institute of Medicine (US) Panel on Micronutrients. Copper. In: Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington DC: National Academies Press; 2001. https://www.ncbi.nlm.nih.gov/books/NBK222312/
- Institute of Medicine (US) Panel on Micronutrients. Vitamin A. In: Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington DC: National Academies Press; 2001. https://www.ncbi.nlm.nih.gov/books/NBK222318/
- Institute of Medicine (US) Panel on Dietary Antioxidants and Related Compounds. Beta-Carotene and Other Carotenoids. In: Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington DC: National Academies Press; 2000. https://www.ncbi.nlm.nih.gov/books/NBK225469/
- Institute of Medicine (US) Panel on Dietary Antioxidants and Related Compounds. Vitamin C. In: Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington DC: National Academies Press; 2000. https://www.ncbi.nlm.nih.gov/books/NBK225480/
- Institute of Medicine (US) Panel on Dietary Antioxidants and Related Compounds. Selenium. In: Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington DC: National Academies Press; 2000. https://www.ncbi.nlm.nih.gov/books/NBK225470/
- Omenn GS, Goodman GE, Thornquist MD, et al. Effects of a combination of beta carotene and vitamin A on lung cancer and cardiovascular disease. N Engl J Med. 1996;334(18):1150-1155. PMID 8602180. https://pubmed.ncbi.nlm.nih.gov/8602180/
- The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group. The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers. N Engl J Med. 1994;330(15):1029-1035. PMID 8127329. https://pubmed.ncbi.nlm.nih.gov/8127329/
- Mzougui S, Favresse J, Soleimani R, Roy T, Gruson D. Biotin interference: evaluation of a new generation of electrochemiluminescent immunoassays for high-sensitive troponin T and thyroid-stimulating hormone testing. Clin Chem Lab Med. 2020;58(12):2037-2045. PMID 32324155. https://pubmed.ncbi.nlm.nih.gov/32324155/
- EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA), Turck D, Bohn T, et al. Scientific opinion on the tolerable upper intake level for selenium. EFSA J. 2023;21(1):e07704. PMID 36698500. https://pubmed.ncbi.nlm.nih.gov/36698500/
- National Eye Institute. Get a Dilated Eye Exam. National Institutes of Health. https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/get-dilated-eye-exam
- MedlinePlus. Vitamin A. U.S. National Library of Medicine. https://medlineplus.gov/ency/article/002400.htm
Know the four TheyaVue numbers before the first capsule
Zinc 32 mg, copper 2 mg, biotin 800 mcg and beta carotene 100 mcg RAE, all per day at two capsules. Three of the four are unremarkable and the fourth depends entirely on what else is in the cupboard.
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