Vitamin C

TL;DR

something.

Water soluble antioxidant.

Vitamin c probably isn't as good (particularly in high doses) as it's widely believed to be. The current perception by most that high doses are beneficial appears to originate from claims made in a number of books written by double Nobel prize winning, American scientist Linus Pauling, written in the 70s.¹ These claims have not been proven.²³

Helps with collagen biosynthesis.

Helps with iron absorption.

Protects against UV damage. Topical application even more.

Avoid taking vitamins, minerals (such as calcium) and other supplements for 30-60 minutes after consuming coffee - it contains compounds (polyphenols) that limit the absorption of many micronutrients.

Food Sources

Forms/Types

There's no difference in absorption between natural and synthetic ascorbic acid or whether ascorbic acid is consumed 'in context' as a part of fruit and/or vegetables or as a supplement.⁴

Quality

As with all supplements - buyer beware. It's quite common for supplements to be contaminated with a variety of impurities, often in the form of heavy metals, and/or contain far more or less of the ingredients stated on the label. There's no simple rule of thumb to avoid this, such as avoiding cheap or imported products; expensive or well-known brands produced in-country may be just as bad. Ideally you should take some time to find products (if you can) that;

have been laboratory tested on behalf of the manufacturer by a reputable body or company that operates in your country or region (here's an example of a Peak Supps creatine supplement available on Amazon in the UK which has been tested by Eurofins: Creatine Monohydrate Powder 1Kg | Pure Micronised | Packaging May Vary - see pictures 3 & 4)
have been laboratory tested by an independent testing company that ranks product purity and ingredient amount accuracy on behalf of consumers (usually funded by affiliate sales of those products). An example of this is Labdoor.

Vitamin C

Food Sources

Forms/Types

Quality

Dosage - How Much?

Deficiency - Too Little

Toxicity - Too Much

Side Effects

When to Avoid Use - Interactions/Contraindications

Random Facts

References

Random Facts