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Switch Nutrition

100% Pure N-Acetyl L-Cysteine

Price $29.90 Save 25% RRP ~~$39.95~~

You'll Earn pts

Price $29.90 Save 25% RRP ~~$39.95~~

You'll Earn pts

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Switch Nutrition 100% Pure N-Acetyl L-Cysteine (NAC) is an unflavoured single-ingredient powder with no added fillers, flavours or sweeteners. NAC is an acetylated form of the amino acid cysteine, which the body uses to help produce glutathione.

Product Strengths

100% pure N-Acetyl L-Cysteine with no fillers, flavours or sweeteners
Unflavoured powder that mixes into water or your preferred beverage
HPLC tested and manufactured in a HACCP and GMP certified facility
Suitable for vegans

Ingredients

N-Acetyl L-Cysteine (NAC) 100%

Each scoop provides 800mg N-Acetyl L-Cysteine.

Allergens

No added fillers, flavours or sweeteners.

Always review label for full list of ingredients.

Suggested Use

Mix 1 scoop (800mg) into 300mL of water or your preferred beverage once daily, or as directed by your healthcare practitioner.

Storage

Store below 30°C in a cool, dry place away from direct sunlight. Keep tightly sealed.

Always read the label and follow the directions for use. Vitamin and mineral supplements should not replace a balanced diet.

Ingredients

100% Pure N-Acetyl L-Cysteine, Capsule (Vegetable Cellulose).

Suggested dose

Adults: Consume 1 serving per day as required or as recommended by your health care provider. NAC has a sour and bitter taste, so it's encapsulated to avoid flavour. Do not exceed more than 1 serving per day.

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L-Cysteine

What is L-cysteine?

L-cysteine is a sulfur-rich amino acid your body can make from methionine. You'll find it as free L-cysteine, as L-cystine (two cysteines joined together) or as a hydrochloride salt. It's a different ingredient from NAC, so check the label for the one you want.

Christina Hanley, BHSc (Nutritional Medicine), Digital Experience & Content Manager, Mr Vitamins

Christina HanleyBHSc (Nutritional Medicine), Digital Experience & Content Manager
Checked this page October 2026

See what we checked

Is L-Cysteine right for you?

Common questions

Is L-cysteine the same as NAC?

No. NAC is N-acetylcysteine, a different ingredient with its own entry in the Australian rules. L-cysteine is permitted as an active ingredient with a 450 mg daily cap. In the listings we've seen, NAC only appears as a tiny inactive ingredient in skin products, which doesn't tell you its status as something you swallow. If it's NAC you're after, ask us.

Why does a cystine or hydrochloride label show a bigger number than 450 mg?

Because the cap is on the cysteine, not the whole compound. Whichever form is on the label, Australian rules cap a product at 450 mg of cysteine a day. Cystine and the hydrochloride salts weigh more per unit of cysteine, so the rules express the same limit as 450 mg of cystine, 585 mg of the hydrochloride or 652 mg of the monohydrate. A bigger number on those labels doesn't mean more cysteine.

The evidence, and its limits

The Australian rules

Cysteine and its related forms are on Australia's permitted ingredients list (Schedule 1, Determination No. 2 of 2026), and every one of them is allowed with conditions. CYSTEINE is item 1688, CYSTINE is item 1691, CYSTEINE HYDROCHLORIDE is item 1689, CYSTEINE HYDROCHLORIDE MONOHYDRATE is item 1690, and D-RIBOSE-L-CYSTEINE is item 1703, which is for medicines taken by mouth only.

The conditions share one rule. A listed medicine can't provide more than 450 mg of cysteine in its maximum recommended daily dose, whether it uses one form or several. The higher figures for cystine and the two salts are the same 450 mg allowing for each form's heavier weight, not an extra allowance.

ACETYLCYSTEINE (N-acetylcysteine, or NAC) is a separate entry, item 356. In the part of Schedule 1 we checked, it's allowed only as a non-active ingredient in medicines applied to the skin, at no more than 0.001%. That doesn't settle NAC's status as something you swallow, so NAC isn't covered here. We found no TGA safety advisory for cysteine. Being allowed isn't the government endorsing any product or claim.

Read the instrument: Schedule 1, item 356.

Not sure this is the right form for you? Ask one of our naturopaths. It is free and takes 10 minutes.

Always read the label and follow the directions for use. General information only, and not a substitute for advice from your doctor or one of our naturopaths.

100% Pure N-Acetyl L-Cysteine

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Terms and Conditions

Description

Product Strengths

Ingredients

Allergens

Suggested Use

Storage

ingredients

suggested dose

Product Strengths

Ingredients

Allergens

Suggested Use

Storage

Ingredients

Suggested dose

What is L-cysteine?

Is L-Cysteine right for you?

Is L-cysteine the same as NAC?

Why does a cystine or hydrochloride label show a bigger number than 450 mg?

The evidence, and its limits

Reviews and Q&A

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