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Goal

Daily Essentials

Common single-nutrient supplements people compare most often. Whether you need any of them depends on your diet, life stage and health — food first, and a clinician can help with testing where relevant.

Ingredients researchers have studied

VITAMIN

Vitamin D

A fat-soluble vitamin sold as D2 or D3. Labels list micrograms (mcg), often with IU in parentheses.

Studied for: Correcting low vitamin D status · Bone health (with calcium)
FATTY ACID

Omega-3

EPA and DHA from fish or algae. The “fish oil” number on the front is rarely the omega-3 number.

Studied for: Triglyceride levels · Cardiovascular outcomes
MINERAL

Magnesium

An essential mineral sold in many salt forms — glycinate, citrate, oxide and more — with very different elemental amounts.

Studied for: Meeting magnesium needs · Occasional constipation (certain forms)
VITAMIN

Vitamin C

Vitamin C (ascorbic acid) is a water-soluble vitamin needed to make collagen and certain neurotransmitters, and it acts

Studied for: Common cold
VITAMIN

Vitamin B12

Vitamin B12 is needed for red blood cell formation, nerve function and DNA synthesis. It is found naturally almost only

Studied for: Preventing or correcting deficiency
MINERAL

Zinc

Zinc is a trace mineral involved in immune function, wound healing and many enzymes. Supplements and lozenges use severa

Studied for: Common cold (lozenges)

Comparisons

VITAMIN D

D2 vs D3

Sources, vegan status and what research says about raising levels.

Compare →
OMEGA-3

Fish Oil vs Algae

Source, EPA/DHA labels, dietary preferences and value.

Compare →

Products

Primary ingredient
Vitamin D3 (Cholecalciferol)
Per serving
25 mcg (1,000 IU) vitamin D
Servings
30
Format
Gummies
Price
Not available
Per serving cost
—
Not verified
View details

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Guides

LABEL BASICS

How to Read a Supplement Label

Serving size, amount per serving, ingredient form, other ingredients and testing information — in the order that matters.
VITAMIN D

How to Compare Vitamin D Supplements

Units, D2 vs D3, source, totals across products and cost per 1,000 IU.

This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.