ONSET Zinc Plus C — Zinc and Vitamin C, a popular immune-support duo in one capsule addressing immune health, skin support, and antioxidant protection. 45 capsules per bottle.
💊 Key ingredients: Zinc + Vitamin C ⏱️ Dosage: As directed on label or by pharmacist 🍽️ Timing: Take with food to minimize stomach irritation 📦 Pack: 45 capsules per bottle ⚡ Highlight: Zinc and Vitamin C work synergistically for immune function and skin health at an accessible price 🌡️ Storage: Store in a cool, dry place below 30°C, away from direct sunlight
ONSET Zinc Plus C is a dietary supplement combining Zinc and Vitamin C in one capsule. Both play important roles in immune system function, and taken together they provide synergistic support that enhances each other's effectiveness.
📊 Key data from leading health organizations
The NIH Office of Dietary Supplements states that Zinc is essential for cellular immune function, DNA synthesis, cell division, and wound healing. The RDA for Zinc is 11mg/day for adult men and 8mg/day for adult women.
Wessels et al. (Nutrients, 2017) describe Zinc as a gatekeeper of immune function, influencing both innate and adaptive immunity including the activity of T cells, NK cells, and macrophages.
NIH notes that Vitamin C is an essential water-soluble antioxidant supporting both innate and adaptive immunity. The RDA is 75mg/day for women and 90mg/day for men. The Upper Tolerable Limit (UL) is 2000mg/day.
Healthline reports that Zinc and Vitamin C work synergistically — Vitamin C can enhance partial Zinc absorption and protects immune cells from free-radical damage, while Zinc supports collagen synthesis alongside Vitamin C.
⚠️ This is a dietary supplement, not a medicine. It is not intended to treat, diagnose, or prevent any specific disease. Pregnant women or those with underlying conditions should consult a doctor before use.
Medically reviewed by
ทีมเนื้อหา Intimo Life | Sources: NIH ODS, Healthline, MedlinePlus, Wessels et al. Nutrients 2017
Last reviewed: 2026-06-25
About ONSET Zinc Plus C
Why take Zinc + Vitamin C together? (Immune synergy)
ONSET Zinc Plus C combines Zinc and Vitamin C in one capsule because both have synergistic mechanisms within the immune system:
Zinc: According to Wessels et al. (Nutrients, 2017), Zinc acts as a gatekeeper of immune function and is required for the development and activity of every type of immune cell — T lymphocytes, NK (Natural Killer) cells, B lymphocytes, and macrophages. Zinc is also a cofactor for more than 300 enzymes in the human body.
Vitamin C: NIH states that Vitamin C supports immunity by stimulating the production and function of leukocytes (white blood cells), particularly neutrophils and lymphocytes. It also protects immune cells from free-radical damage generated during the immune response to infection.
The synergy: Vitamin C helps maintain Zinc levels within immune cells, while Zinc supports Vitamin C metabolism in the body. Together they perform more effectively than either alone.
This is a dietary supplement, not a medicine. Claims reflect nutritional-level physiological support.
What is Zinc used for? The role of Zinc in the body
Zinc in ONSET Zinc Plus C may help support several body functions, according to NIH ODS and Healthline data:
Immune system: Zinc is required for the development and activity of all types of immune cells. Even mild Zinc deficiency can impair cellular immune function.
Wound healing: Zinc plays a role in wound healing at both the skin and tissue level, as it is a key component of protein synthesis and cell division processes.
DNA synthesis and cell division: Zinc is required for DNA polymerase — the key enzyme in DNA synthesis — enabling normal cell division and tissue growth.
Taste and smell: Zinc is necessary for the senses of taste and smell. Zinc deficiency may cause reduced taste and smell perception.
Skin and hair health: Zinc supports collagen synthesis and skin tissue repair.
⚠️ ONSET Zinc Plus C is a dietary supplement, not a medicine. Listed benefits reflect nutritional-level physiological support, not treatment of any specific disease.
Vitamin C in ONSET Zinc Plus C — role and antioxidant benefits
Vitamin C in ONSET Zinc Plus C plays two primary roles, according to NIH ODS:
1. Immune support: Vitamin C stimulates the production and function of leukocytes (white blood cells), especially neutrophils and lymphocytes, and helps these immune cells migrate to sites of inflammation more efficiently. The body accumulates Vitamin C in high concentrations within phagocytic cells to combat pathogens.
2. Antioxidant cell protection: Vitamin C is a water-soluble antioxidant capable of neutralizing free radicals in both intracellular water and plasma. It protects skin cells, immune cells, and DNA from oxidative stress damage. It also plays a role in collagen synthesis, which is important for skin and tissue health.
Vitamin C RDA for adults per NIH: 75mg/day (women), 90mg/day (men) | Upper Tolerable Limit (UL): 2000mg/day
How to take ONSET Zinc Plus C / Recommended dosage
ONSET Zinc Plus C is taken as follows:
General adult dosage: As directed on the product label or by a doctor or pharmacist.
Timing: Take with food. Zinc may cause nausea when taken on an empty stomach; having food in the stomach reduces irritation and improves absorption.
Zinc RDA: NIH sets the Zinc RDA at 11mg/day (men) and 8mg/day (women). The Upper Tolerable Limit (UL) for Zinc is 40mg/day. Do not exceed the UL from all sources combined without medical supervision.
Vitamin C RDA: NIH sets the Vitamin C RDA at 75mg/day (women) and 90mg/day (men). The Upper Tolerable Limit (UL) is 2000mg/day.
Do not crush or chew: Swallow capsules whole with a full glass of water.
If a dose is missed, take it as soon as you remember. If it is almost time for the next dose, skip the missed dose and resume the regular schedule. Do not double the dose to compensate.
Side effects of ONSET Zinc Plus C to be aware of
ONSET Zinc Plus C is generally safe at recommended doses. However, some side effects may occur:
Common Zinc side effects: Nausea, vomiting, stomach pain — typically when taken on an empty stomach. Taking with food resolves this in most cases.
Excessive Zinc intake (above UL of 40mg/day): May interfere with Copper absorption over time, potentially causing Copper deficiency. Very high Zinc intake may also reduce HDL (good cholesterol) and suppress immune function. Do not exceed the UL without medical supervision.
High-dose Vitamin C side effects: Vitamin C above 2000mg/day may cause diarrhea, nausea, and stomach cramps. Those with a history of oxalate kidney stones should consult a doctor before supplementing.
Rare: Allergic reactions (rash, swelling, breathing difficulty) — stop use immediately and seek medical attention if these occur.
Consult a doctor or pharmacist if you experience any unusual symptoms after taking this supplement.
Contraindications / Precautions for ONSET Zinc Plus C
Before taking ONSET Zinc Plus C, please be aware of the following important precautions:
⚠️ Users taking antibiotics (e.g., Tetracycline, Ciprofloxacin, Norfloxacin): Zinc can bind to quinolone and tetracycline antibiotics, reducing their absorption. Separate intake by at least 2 hours before or after the antibiotic. Always consult a pharmacist first.
⚠️ Users taking Penicillamine (used for Wilson disease and rheumatoid arthritis): Zinc may reduce Penicillamine absorption. Consult your doctor before use.
⚠️ Pregnant or breastfeeding women: Zinc and Vitamin C are important for development, but consult your doctor before taking any supplement so that an appropriate and safe dose can be determined.
Kidney stone patients: High-dose Vitamin C may increase urinary oxalate excretion, potentially increasing kidney stone risk in susceptible individuals. Consult your doctor first.
Hemochromatosis patients: A condition of excessive iron absorption. High Vitamin C may increase iron absorption further. Consult a doctor before use.
Children under 12 years: Consult a doctor or pharmacist before use.
ONSET Zinc Plus C — what can or cannot be combined?
ONSET Zinc Plus C can generally be combined with many supplements, but certain medications require caution:
Generally safe to combine: Vitamin D, Vitamin E, Omega-3, Magnesium, Collagen — no known harmful interactions. The Vitamin C in ONSET also helps increase non-heme iron absorption from food.
⚠️ Caution — antibiotics (Quinolones, Tetracyclines): Zinc binds to these drug classes, reducing their efficacy. Separate intake by at least 2 hours.
⚠️ Penicillamine: Zinc reduces Penicillamine absorption — always consult your doctor first.
Caution — multiple Zinc sources: If taking a multivitamin or other supplement containing Zinc, calculate total daily Zinc intake to stay within the UL of 40mg/day.
Caution — Vitamin C overlap: If also taking separate Vitamin C supplements, calculate combined intake to stay below 2000mg/day.
Iron: Vitamin C enhances non-heme iron absorption, beneficial for those with iron deficiency — but those with hemochromatosis should exercise caution.
For safety, always inform your doctor or pharmacist of all supplements and medications before starting any new supplement.
Where to buy ONSET Zinc Plus C?
Where to buy ONSET Zinc Plus C?
Order genuine ONSET Zinc Plus C at Intimo Life. Delivery across Thailand in 1–3 business days. Shipped in discreet packaging — product name is not indicated on the outer box. Browse all zinc products at Zinc at Intimo Life
Take ONSET Zinc Plus C with a meal to reduce the risk of Zinc-related nausea. There is no strict requirement for which meal — choose the time that is easiest to remember and maintain daily. Consistency matters most. Vitamin C in this formula is water-soluble and absorbs well regardless of meal timing, while Zinc absorbs better when taken with or shortly after food.
Yes — Zinc has an Upper Tolerable Intake Level (UL) set by NIH at 40mg/day for adults. Long-term intake above the UL can cause Copper deficiency because Zinc and Copper compete for absorption in the intestine. Very high Zinc intake may also reduce HDL cholesterol and suppress immune function. If taking ONSET Zinc Plus C alongside a multivitamin or other Zinc-containing supplement, calculate total daily Zinc from all sources and stay within 40mg/day without medical supervision.
Zinc and Vitamin C are important nutrients during pregnancy. However, pregnant and breastfeeding women should always consult their doctor before taking ONSET Zinc Plus C or any dietary supplement so that individual requirements can be assessed and an appropriate, safe dose determined. The Zinc RDA during pregnancy is 11mg/day and during breastfeeding 12mg/day per NIH, which may differ from the amount in a general supplement.
Zinc interacts with certain antibiotic classes, particularly Quinolones (e.g., Ciprofloxacin, Norfloxacin, Ofloxacin) and Tetracyclines (e.g., Doxycycline, Tetracycline). Zinc can bind to these medications forming a chelate complex that reduces drug absorption and effectiveness. MedlinePlus and NIH recommend separating Zinc and antibiotic intake by at least 2 hours (take the antibiotic first, then Zinc 2 hours later, or vice versa). Always consult a pharmacist when taking antibiotics alongside Zinc supplementation.
Vitamin C in ONSET Zinc Plus C supports skin health in two primary ways per NIH ODS: (1) Collagen synthesis: Vitamin C is an essential cofactor for Prolyl hydroxylase and Lysyl hydroxylase enzymes that convert proline and lysine to hydroxyproline and hydroxylysine — required for building a stable collagen triple helix. Without adequate Vitamin C, collagen synthesis halts, directly impacting skin structure. (2) Antioxidant skin protection: Vitamin C neutralizes free radicals in and around skin cells, reducing oxidative stress damage that contributes to skin aging. The Zinc in ONSET additionally supports collagen synthesis and skin tissue repair.
Choose ONSET Zinc Plus C when: you want Zinc and Vitamin C conveniently in one capsule, you want the synergistic immune support of both nutrients together, or you want Vitamin C for collagen synthesis and skin protection alongside Zinc. | Choose plain Zinc when: you already get sufficient Vitamin C from diet or other supplements, you need to control Zinc and Vitamin C doses separately with precision, or your doctor has a specific medical reason. Browse all zinc products at Zinc at Intimo Life
According to NIH ODS and Healthline, Zinc deficiency can present with a variety of symptoms: weakened immune function (more frequent infections), reduced taste and smell perception, slow wound healing, hair loss, dry skin or acne, growth retardation (in children), and chronic diarrhea. Mild Zinc deficiency is more common in vegetarians and vegans, older adults, heavy alcohol consumers, and those with gastrointestinal disorders. Confirmation requires a blood Zinc level test. Consult a doctor for diagnosis and appropriate supplementation guidance.
ONSET Zinc Plus C delivers Zinc + Vitamin C in one capsule, providing nutritional support for: immune function (Zinc as immune gatekeeper + Vitamin C stimulates white blood cells), antioxidant protection (Vitamin C as water-soluble antioxidant), skin health and collagen synthesis (Vitamin C enables collagen production + Zinc supports tissue repair), and wound healing (Zinc). It is a dietary supplement, not a medicine — an accessible-price option for those wanting combined Zinc and Vitamin C supplementation in a single capsule. Browse zinc products at Zinc at Intimo Life
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