Vitamin C, D3, Zinc, Elderberry & Echinacea: A Plain-English Guide
Vitamin C, vitamin D3 and zinc are some of the most popular everyday nutrients, especially in fall and winter. Elderberry and echinacea are classic botanicals that often appear next to them. This guide explains what each one is, what the label numbers mean, and how to choose a combined formula.
Vitamin C
Vitamin C (ascorbic acid) is a water-soluble vitamin the body cannot make, so it must come from food or supplements. Good sources are citrus fruits, kiwi, bell peppers, berries and broccoli. Vitamin C contributes to the normal function of the immune system and to the protection of cells from oxidative stress. It also contributes to normal collagen formation.
Vitamin D3
Vitamin D is special: your skin makes it in sunlight. In fall and winter, or if you spend most of your time indoors, many people make very little. Vitamin D contributes to the normal function of the immune system and to the maintenance of normal bones. Most quality supplements use D3 (cholecalciferol). Read more in our Vitamin D3 + K2 guide.
Zinc
Zinc is an essential trace mineral found in meat, shellfish, legumes, seeds and nuts. Zinc contributes to the normal function of the immune system and to normal macronutrient metabolism. Common forms on labels are zinc citrate, gluconate and picolinate.
Good to know: more zinc is not better. Long-term high doses can interfere with copper levels. Stay with the recommended amount.
Vitamin E and B6
- Vitamin E contributes to the protection of cells from oxidative stress.
- Vitamin B6 contributes to normal function of the immune system and energy metabolism.
Elderberry
Black elderberry (Sambucus nigra) is a shrub common across Europe and North America. Its dark purple berries have been used for centuries in traditional syrups, jams and teas, especially in the colder months. Note: raw, unripe elderberries should not be eaten. Supplements use processed extracts.
Echinacea
Echinacea, or purple coneflower, is a flowering plant native to North America. It was traditionally used by Native American tribes and is one of the best-known traditional botanicals in the US.
Citrus Bioflavonoids and L-Lysine
- Citrus bioflavonoids are natural plant compounds from citrus peel, often paired with vitamin C.
- L-lysine is an essential amino acid found in protein-rich foods.
Food First
Supplements add to a healthy lifestyle; they do not replace it. Plenty of fruits and vegetables, enough sleep, regular movement, washing your hands and staying up to date with your doctor's recommendations matter more than any capsule.
Who Should Be Careful?
Talk to your doctor before use if you have an autoimmune condition, take immunosuppressant medication, are pregnant or nursing, or are under 18. People allergic to plants in the daisy family should be careful with echinacea.
Checklist Before You Buy
- Are the amounts of vitamin C, D3 and zinc listed?
- Which form of zinc is used?
- Are elderberry and echinacea amounts listed?
- Is the capsule gelatin or vegetarian?
- Is it made in a GMP-certified facility?
Our Formula
SUPPLI-X Vitamin C, D3 & Zinc Complex combines 180 mg vitamin C, 40 mcg vitamin D3, 15 mg vitamin E, 1.7 mg vitamin B6 and 11 mg zinc citrate with 500 mg elderberry extract, 200 mg echinacea, 100 mg citrus bioflavonoids and 100 mg L-lysine per 2 capsules. Gluten-free, lactose-free, 60 gelatin capsules, made in the USA in a facility GMP-certified by UL Solutions.
See Vitamin C, D3 & Zinc Complex →
FAQ
Why combine vitamin C, D3 and zinc?
All three contribute to the normal function of the immune system, so they are often taken together in one daily formula.
What is elderberry?
Black elderberry (Sambucus nigra) is a shrub whose berries have been used for centuries in traditional syrups and teas.
Can I take too much zinc?
Yes. Long-term high doses can interfere with copper levels. Stay with the recommended amount.
Who should ask a doctor first?
Anyone with an autoimmune condition, on immunosuppressant medication, pregnant or nursing, or under 18.
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. If you are pregnant, nursing, taking medication or have a medical condition, talk to your healthcare provider before using any supplement.
