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Letter Vitamins

42 results

Products

What are letter vitamins?

Letter vitamins are the individual vitamins sold on their own rather than inside a multivitamin: A, the B group, C, D, E and K. Buying them separately makes sense when you have a specific shortfall to address rather than a general wish to cover gaps, because you can take a proper dose of the one you need instead of a token amount of everything.

The important distinction is between water soluble and fat soluble. The B group and vitamin C dissolve in water and excess is largely passed in urine, so they are comparatively forgiving. Vitamins A, D, E and K are fat soluble, stored in the body, and accumulate if you take too much over time. The Nutrient Reference Values publish upper levels for exactly this reason.

Why shop letter vitamins at Supplement Mart?

  • 106 single vitamin products in stock, across tablets, capsules, liquids and powders
  • 58 stores nationwide, with click and collect available
  • Free shipping Australia-wide on orders over $150, with no surcharges
  • East and west coast dispatch on orders placed before 2pm on weekdays
  • Supplement Mart Rewards, earning points on every dollar spent
  • An in-house nutritionist you can actually ask a question

How they are usually used

Most are taken once daily with food. Fat soluble vitamins absorb better alongside a meal containing some fat. Vitamin C in large single doses is simply excreted, so splitting it across the day is more useful than one large tablet. Supplements are not a substitute for medical advice. If you are pregnant or breastfeeding, take prescription medication, or are managing a health condition, check with your doctor or pharmacist before starting something new.

Frequently asked questions

Should I take individual vitamins or a multivitamin?

A multivitamin covers small gaps broadly at low doses. An individual vitamin lets you address a known shortfall at a meaningful dose. If a blood test has shown you are low in something, the single vitamin is the right tool. For general cover without a specific concern, a multivitamin is simpler.

Can I take too much of a vitamin?

Yes, particularly A, D, E and K, which are stored rather than excreted. Excess vitamin A is a known risk in pregnancy, and very high vitamin D over long periods raises blood calcium. Water soluble vitamins are more forgiving, though high dose B6 over time can cause nerve problems.

Does vitamin C prevent colds?

Routine supplementation does not appear to prevent colds in the general population. Reviews suggest it may slightly shorten how long a cold lasts, and there is some benefit for people under heavy physical stress. The common belief that it stops you catching one is not well supported.

Do I need vitamin D in Australia?

It depends on sun exposure rather than latitude alone. Plenty of Australians are low, particularly in southern states through winter, people who work indoors, those who cover up for cultural reasons, and anyone with darker skin. A blood test through your doctor is the way to know rather than guessing.

Which B vitamins matter most?

That depends on your diet. B12 is the one to watch on a vegan or vegetarian diet, since it occurs naturally only in animal foods. Folate matters particularly before and during early pregnancy. The rest are widely available across a varied diet.

Sources

Last reviewed: 10 October 2026