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What is One A Day?
What is One A Day?
One A Day is a multivitamin product designed to provide essential nutrients that the body needs for daily wellness and nutritional support. They are available over the counter (OTC) and are made to help fill gaps in the diet when people may not get enough essential vitamins and minerals from food alone.
There are also specialized formulas such as One A Day Men, One A Day Multivitamin for Women, Women’s 50+, and One A Day Prenatal options. Each formula is tailored to meet different nutritional needs, such as bone health, heart health, immune support, and energy metabolism.
Order One A Day online today and save!
Purchase One A Day from Universal Drugstore today and save!
Select your dosage:
- All Strength's
One A Day brand
One A Day Advance Mens Multivitamins
Product of Canada
Marketed as One A Day Mens 50+ Multivitamins in Canada.
One A Day Advance Women Multivitamins
Product of Canada
(generic One A Day)
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Important information about One A Day
The active ingredient in One A Day is a combination of essential vitamins and minerals, including vitamin C, vitamin D, vitamin E, vitamin B12, folic acid, calcium, and biotin.
They work together to support many functions in the body. For example, B vitamins help with energy metabolism and the production of red blood cells. Vitamin D and calcium play a key role in bone health, while vitamin C supports immune health and helps the body absorb iron. DHA in prenatal vitamins will support brain and eye development during pregnancy. Some formulas may include a probiotic or additional nutrients to support digestion and overall wellness.
Follow all directions given to you by your doctor and read all documents provided, including the full Prescribing Information, FDA-Approved Product Labeling, Instructions for Use, and Medication Guide before using One A Day. However, the following is a synopsis of the general guidelines for the use of One A Day:
- Most One A Day multivitamin products are taken once daily, usually with food to help improve absorption and reduce stomach upset. They should be taken with a full glass of water.
- Different formulas, such as Multivitamin for Men or One A Day Prenatal, may have slightly different instructions. Always follow the label for your specific product.
- Do not take more than the recommended dose, as excessive intake of vitamins and minerals can be harmful.
- If you miss a dose, simply take the next dose at your regular time.
- Many retailers offer options like subscriptions or same-day delivery, making it easy to maintain consistent use.
Some mild or common side effects of One A Day seen in clinical trials as compared to placebo include:
- Mild stomach upset
- Nausea
- Constipation or diarrhea
- Unusual taste in the mouth
- Headache
Some individuals may experience serious side effects while using One A Day. These side effects may require immediate medical attention. If you experience any of the following, contact your healthcare provider or seek emergency medical help:
- Signs of an allergic reaction, such as rash, itching, or swelling
- Severe stomach pain
- Vomiting or difficulty swallowing
- Symptoms of vitamin overdose, such as confusion or severe weakness
These are not all of the possible side effects of One A Day. You should always seek medical advice from your healthcare provider for any questions or concerns about your medical condition or treatment. Read all patient information, medication guides, or drug information sheets that come with this medication. You can also report adverse effects to the Food and Drug Administration at www.fda.gov/medwatch or 1-800-FDA-1088.
Before starting One A Day, it is crucial to discuss any existing health conditions with your healthcare provider. You should be sure that your healthcare provider is aware of all your medical conditions, including if you have:
- Kidney disease or liver problems
- High levels of certain vitamins or minerals
- Chronic health conditions requiring nutritional monitoring
- Pregnancy or plans to use prenatal vitamins
- Allergies to ingredients in multivitamin gummies or tablets
Vitamins, such as vitamin E or vitamin D, can build up in the body if taken in excess. It is important to avoid combining multiple supplements without medical advice.
One A Day may not be appropriate for individuals who:
- Have known hypersensitivity to any ingredient
- Are already taking high-dose vitamin or mineral supplements
- Have conditions that require restricted intake of certain nutrients
Always consult your healthcare provider to ensure the product matches your nutritional needs.
One A Day begins supplying nutrients to your body as soon as they are absorbed. However, noticeable benefits such as improved energy or immune support may take several weeks of regular use. Results depend on your diet, overall health, and specific nutritional deficiencies.
When One A Day is taken with other prescription drugs, over-the-counter medications, vitamins, and supplements, it may change how they work or increase the frequency or severity of side effects. Make sure that you tell your healthcare professional about anything that you are taking to avoid any negative drug interactions, including:
- Other vitamins or mineral supplements
- Calcium or iron supplements
- Certain antibiotics
- Medications for thyroid conditions
- Blood thinners
Taking multiple products with similar ingredients may lead to excessive intake of certain nutrients.
One A Day vitamins are not described in traditional doses like prescription drugs. Instead, they are formulated as daily servings that contain specific amounts of vitamins and minerals.
These include:
- Multivitamin tablets
- Multivitamin gummies
- Softgels
- Specialized formulas like Women’s 50+ and Multivitamin for Men
Each product lists its nutrient content in milligrams (mg) or micrograms (mcg) to match daily nutritional needs.
Store One A Day at room temperature in a dry place away from moisture and heat. Keep the bottle tightly closed. Always keep vitamins out of the reach of children to prevent accidental ingestion.
One A Day products are manufactured by Bayer, a global company known for producing a wide range of health and wellness products.
There is no exact generic name equivalent to One A Day. However, many other multivitamin products are available that provide similar essential nutrients and health support.
You can stop taking One A Day at any time. However, if you are using it to address a nutritional deficiency, stopping may reduce your nutrient intake.
Some One A Day products, such as One A Day prenatal, are specifically designed to support pregnancy with nutrients like folic acid and DHA. Talk to your doctor if you are already pregnant or if you have any plans to become pregnant. They will know or recommend what is best for you.
Certain multivitamins can support both maternal health and infant development, but your healthcare provider will guide the best option for you. Talk to your doctor if you are already breastfeeding or if you have any plans to breastfeed. They will know or recommend what is best for you.
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Click to joinImportant information about buying One A Day from UniversalDrugstore™
We ship to destinations within the United States, including Alaska and Hawaii, as well as internationally. Delivery typically takes about 2 weeks for orders shipped within the U.S. and Canada, and about 4 weeks for international orders, depending on your location and customs processing.
Once you complete your order, we process, verify, and dispatch your medication. You’ll receive email updates at each stage, including tracking details once your order ships. If any additional documentation is needed (such as a valid prescription), we’ll contact you promptly. Once approved, your order is charged and delivered directly to your doorstep.
Orders are typically processed within 1–3 business days once all required documents are received and approved. Standard delivery times range from 10–18 business days, depending on your location.
Yes! Once your medication ships, you will receive an email with tracking information so you can monitor your shipment every step of the way.
Our Customer Care team is available 24/7 to assist with any order-related concerns or questions. If you experience delays, missing items, or need support, contact us using the details provided in your confirmation email.
All orders are shipped in discreet, plain packaging to protect your privacy. Medications are securely packaged to prevent damage and ensure they arrive in top condition.
Yes. We use cold-chain shipping methods to safely transport temperature-sensitive medications, ensuring they maintain proper storage conditions throughout delivery.
Shipping costs vary depending on your location and shipping method. Free shipping promotions may be available—check the checkout page for the latest offers. Orders above $100 going to a US destination will receive free shipping.
Currently, we do not bill Medicare or Medicaid directly. However, we provide detailed receipts and documentation that you can submit to your insurance provider for potential reimbursement.
Universal Drugstore does not bill private health insurance directly, but we provide a detailed invoice that you can submit to your insurer for possible reimbursement. Many insurers will accept Universal Drugstore’s documents, but if you have any questions, check with your insurance company prior to purchasing.
We use advanced SSL encryption and secure payment processing to ensure that all transactions are 100% protected against fraud and unauthorized access.
Universal Drugstore offers many generic alternatives that provide the same active ingredients at a lower cost. Search for your medication and compare pricing for generic vs. brand-name options. Generic availability depends on the medication.
If your medication requires a prescription, you must upload it online, via email, or fax. Over-the-counter (OTC) medications do not require a prescription. All prescription medication purchases require a valid and approved prescription. The Universal Drugstore customer care team can contact your doctor directly to get your prescription, and ensure all information is up to date.
Yes! You can add multiple medications to your cart, including prescription, OTC, and pet medications, and complete your purchase in a single checkout process.
Yes! If your prescription includes refills, you can reorder quickly by logging into your account and selecting your medication for a hassle-free refill process. Always refill your medication proactively and ontime, to ensure you do not run out of important medication.
Yes! We offer:
- Up to 80% savings on medications
- Price match guarantee – we’ll match competitor pricing on qualifying medications
- 10% off your first order for new customers
We offer 24/7 customer support via phone, email, and chat. Visit our Contact Us page for assistance with ordering, shipping, or medication questions.
Medical Disclaimer
The information, including but not limited to, text, graphics, images and other material contained on this website are for informational purposes to increase health awareness only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment.
Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition or treatment and before undertaking a new health care regimen, and never disregard professional medical advice or delay in seeking it because of something you have read on this website.

Jamie Winn, PharmD, is a licensed pharmacist and seasoned medical content reviewer with over 20 years of experience in clinical pharmacy, patient care, and healthcare leadership.
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Shirley is a Medical Writer and first-year Doctor of Pharmacy (PharmD) student at the University of Alberta, where she is building on her strong foundation in health sciences and patient care.
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