Daily Foundation · Immune Support†
L-OptiZinc® Zinc
- Zinc supports normal immune function and is required for the activity of hundreds of enzymes.†
- 20 mg zinc per tablet
- 182% Daily Value
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- Made in USA
- cGMP facility
- Every dose disclosed
Key ingredient
20mg
Zinc
Zinc is required for the activity of hundreds of enzymes and plays a role in immune function, protein and DNA synthesis, and cell division.†
Supplement Facts
Serving size: 1 Tablet
Servings per container: 100
| Amount per serving | Amount | % DV |
|---|---|---|
| Zinc (as zinc mono-L-methionine) | 20 mg | 182% |
Other ingredients: Dicalcium phosphate, cellulose, vegetable stearin, cellulose gum, magnesium stearate and silica.
Dietary
Free from
Gluten, gmo ingredients, artificial colors, artificial flavors, sweeteners.
Manufacturing
Made with globally sourced ingredients in an NPA GMP-certified, third-party audited, FDA-registered cGMP facility.
How to use
- Serving
- 1 tablet
- Count
- 100 tablets
- Take with
- A meal
- Storage
- Cool, dry place
Adults: take one tablet daily with a meal. One tablet is the full daily serving. The adult upper limit for zinc is 40 mg a day from all sources, food included, so do not combine this with other zinc supplements and count the zinc in any multivitamin you take. Store in a cool, dry place.
Who it's for
- Adults who want daily zinc for normal immune function†
- People eating mostly plant-based diets, which tend to supply less absorbable zinc
- Athletes and people who train hard
- Diets light on meat, shellfish and dairy
Not recommended for
- Anyone already taking a multivitamin or other supplement with zinc, without checking the total
- Pregnant or breastfeeding individuals without medical guidance
- Anyone under 18
- People on quinolone or tetracycline antibiotics, penicillamine or thiazide diuretics, without checking with a doctor or pharmacist
- Anyone who wants copper included; this is zinc only
FAQ
Why 20 mg and not 50 mg?
The adult upper limit for zinc is 40 mg a day from food and supplements combined. It is set there because sustained high zinc intake interferes with copper absorption. A 50 mg tablet is over that limit before you have eaten anything. At 20 mg you get 182% of the Daily Value and still have room for the zinc in your food. For the same reason the serving is one tablet a day; two would reach the limit on their own.
What is L-OptiZinc®?
L-OptiZinc® is Lonza's branded zinc mono-L-methionine: each zinc ion is bound to one molecule of the amino acid L-methionine. In a small human study, zinc methionine raised blood zinc more than zinc sulfate when both were taken with water. Most of the other absorption research on this form was done in animals, so we keep the claim to that.
Should I take it with food?
Yes. The label says with a meal, and zinc on an empty stomach can cause nausea. Phytates in whole grains and legumes bind zinc in the gut, so a meal that is lighter on those is a good one to pick.
Do I need copper with it?
This tablet contains no copper. The copper concern comes from sustained high zinc intake: the NIH notes that 50 mg or more a day for weeks can interfere with copper absorption, and the 40 mg upper limit is set with copper in mind. One tablet is 20 mg. If you plan to take zinc long term and have questions about copper, ask your healthcare provider.
Can I take it with a multivitamin or iron?
Check the multivitamin label first. Many contain zinc, and all of it counts toward the 40 mg a day upper limit. Iron supplements of 25 mg or more taken at the same time can reduce zinc absorption, so take those with a different meal.
Does it interact with medications?
It can. Zinc can interfere with quinolone and tetracycline antibiotics and with penicillamine when they are taken at the same time, and thiazide diuretics increase zinc loss. If you take any prescription medication, check with your doctor or pharmacist before starting.
Where and how is it made?
In the USA, with globally sourced ingredients, in an NPA GMP-certified, third-party audited, FDA-registered facility that follows FDA's cGMP rules for dietary supplements (21 CFR Part 111).
What are the other ingredients for?
They make the tablet. Dicalcium phosphate and cellulose form its body, cellulose gum helps it break apart after you swallow it, and vegetable stearin, magnesium stearate and silica keep the powder flowing and off the tablet press. There are no colors, flavors or sweeteners.
Can I take it with Men's Vitality?
We do not recommend it. Men's Vitality already provides 15 mg of zinc, and together with this tablet and the zinc in food you would be close to the 40 mg a day adult upper limit.
Who should not take it?
It is for adults. If you are pregnant or breastfeeding, check with your healthcare provider first.
What research is behind the ingredients?
-
Zinc is essential for normal immune function. Zinc ions help regulate signaling inside the cells of both the innate and the adaptive immune system.
Wessels I, Maywald M, Rink L. Zinc as a Gatekeeper of Immune Function. Nutrients. 2017;9(12):1286. Source (opens in a new tab)
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In a crossover study of nine adults given 25 mg of zinc with water, zinc methionine raised plasma zinc more than zinc sulfate over four hours. When the same doses were taken with a high-phytate, plant-based meal, none of the forms tested offset the meal's effect.
Rosado JL, Muñoz E, López P, Allen LH. Absorption of zinc sulfate, methionine, and polyascorbate in the presence and absence of a plant-based rural Mexican diet. Nutrition Research. 1993;13(10):1141–1151. Source (opens in a new tab)
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Phytate, found in staple foods such as cereals, corn and rice, has a strong negative effect on zinc absorption from mixed meals.
Lönnerdal B. Dietary factors influencing zinc absorption. Journal of Nutrition. 2000;130(5S Suppl):1378S–1383S. Source (opens in a new tab)
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A systematic review of 12 studies found that athletes had lower serum zinc than non-athletes despite eating more zinc. The authors suggest athletes may have a higher zinc requirement than people who are physically inactive.
Chu A, Holdaway C, Varma T, Petocz P, Samman S. Lower Serum Zinc Concentration Despite Higher Dietary Zinc Intake in Athletes: A Systematic Review and Meta-analysis. Sports Medicine. 2018;48(2):327–336. Source (opens in a new tab)
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The Tolerable Upper Intake Level for adults is 40 mg of zinc a day from food and supplements, set on the basis of zinc's effect on copper status. Doses of 50 mg or more taken for weeks can interfere with copper absorption.
National Institutes of Health, Office of Dietary Supplements. Zinc: Fact Sheet for Health Professionals. Updated January 6, 2026. Source (opens in a new tab)
Research describes the ingredients, not this finished product. It is not a claim that this product diagnoses, treats, cures or prevents any disease.
†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L-OptiZinc® is a registered trademark of Lonza.
The MAXIS Journal
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