We earn commission on purchases made through our links. It never affects ranking: tables are ordered purely by price per dose, and no retailer or brand can pay for position.We earn commission when you buy through our links. It never affects the ranking. Full disclosure.

perdose
Updated

Home › Amino acids & derivatives › N-Acetyl Cysteine

Pure EncapsulationsAmino acids & derivatives

PureDefense, 120 capsules

£65.50 for 120 capsules at Healf. It carries more than one active ingredient, so it is not ranked against single-ingredient products. Each price below counts one ingredient only.

What it really costs, per 600 mg£1.46One 600 mg dose is our comparison unit for N-Acetyl Cysteine. It is not a recommendation.
A day£1.46
A week£10.19
A month£43.67
A year£531.28

At one 600 mg dose a day, this pack lasts 45 days. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

N-Acetyl Cysteine

  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 450 mg = 27 g
  • £65.50 ÷ 27 g × 600 mg = £1.46 per 600 mg
  • A week £1.46 × 7 = £10.19 · a month × 30 = £43.67 · a year × 365 = £531.28
  • Amount per serving: stated on the label.

Elderberry

  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 200 mg = 12 g
  • £65.50 ÷ 12 g × 500 mg = £2.73 per 500 mg
  • A week £2.73 × 7 = £19.10 · a month × 30 = £81.88 · a year × 365 = £996.15
  • Amount per serving: extract weight stated on the label.

Quercetin

  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 25 mg = 1.5 g
  • £65.50 ÷ 1.5 g × 500 mg = £21.83 per 500 mg
  • A week £21.83 × 7 = £152.83 · a month × 30 = £655.00 · a year × 365 = £7969.17
  • Amount per serving: stated on the label.

Vitamin C

  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 250 mg = 15 g
  • £65.50 ÷ 15 g × 1 g = £4.37 per 1 g
  • A week £4.37 × 7 = £30.57 · a month × 30 = £131.00 · a year × 365 = £1593.83
  • Amount per serving: stated on the label.

Vitamin D3

  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 1,000 IU = 60,000 IU
  • £65.50 ÷ 60,000 IU × 1,000 IU = £1.09 per 1,000 IU
  • A week £1.09 × 7 = £7.64 · a month × 30 = £32.75 · a year × 365 = £398.46
  • Amount per serving: stated on the label.

Zinc

  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 7.5 mg = 450 mg
  • £65.50 ÷ 450 mg × 15 mg = £2.18 per 15 mg zinc
  • A week £2.18 × 7 = £15.28 · a month × 30 = £65.50 · a year × 365 = £796.92
  • Amount per serving: stated on the label.

The standard dose is a comparison unit, not a recommendation. Always confirm the price on the retailer's site. How we compare everything.

How it compares: N-Acetyl Cysteine NAC

All 28, ranked →
N Acetyl L Cysteine (NAC)Cheapest per 600 mgBulk · 700 mg a serving · £1.17 a month · a pack lasts 4.6 years4p£64.99View at Bulk (opens in a new tab)
N Acetyl L Cysteine (NAC)Bulk · 700 mg a serving · £1.26 a month · a pack lasts 2.3 years4p£34.99View at Bulk (opens in a new tab)
N Acetyl L Cysteine (NAC)Bulk · 700 mg a serving · £1.80 a month · a pack lasts 5 months6p£9.99View at Bulk (opens in a new tab)
This productHealf · 450 mg a serving · £43.67 a month · a pack lasts 45 days£1.46shown above

Ranked purely by price per 600 mg. 44 combination products also contain N-Acetyl Cysteine.

How it compares: elderberry extract

Compare every product in this form →
Elderberry for Kids DropsCheapest per 500 mgHealf · 37.5 mg a serving · £66.63 a month · a pack lasts 9 days£2.22£19.99View at Healf (opens in a new tab)
SambucolImmuno Forte Black Elderberry 30 GummiesHolland & Barrett · 50 mg a serving · £125.00 a month · a pack lasts 3 days£4.17£12.50View at Holland & Barrett (opens in a new tab)
Viridian NutritionOrganic Elderberry & Vit C ExtractViridian Nutrition · 800 mg a serving · £23.58 a month · a pack lasts 32 days79p£25.15View at Viridian Nutrition (opens in a new tab)
This productHealf · 200 mg a serving · £81.88 a month · a pack lasts 24 days£2.73shown above

Ranked purely by price per 500 mg. 22 combination products also contain elderberry.

How it compares: quercetin

All 17, ranked →
VitaBrightQuercetin CapsulesCheapest per 500 mgVitaBright · 1 g a serving · £2.50 a month · a pack lasts 2 years8p£59.97View at VitaBright (opens in a new tab)
VitaBrightQuercetin CapsulesVitaBright · 1 g a serving · £2.67 a month · a pack lasts 1.5 years9p£47.99View at VitaBright (opens in a new tab)
VitaBrightQuercetin CapsulesVitaBright · 1 g a serving · £2.83 a month · a pack lasts 12 months9p£33.99View at VitaBright (opens in a new tab)
This productHealf · 25 mg a serving · £655.00 a month · a pack lasts 3 days£21.83shown above

Ranked purely by price per 500 mg. 56 combination products also contain quercetin.

How it compares: vitamin C

All 113, ranked →
Vitamin C Plus TabletsCheapest per 1 gMyprotein · 1 g a serving · £1.00 a month · a pack lasts 6 months3p£5.99View at Myprotein (opens in a new tab)
Vitamin C Crystals PowderHealf · 1.1 g a serving · £1.01 a month · a pack lasts 7 months3p£7.61View at Healf (opens in a new tab)
Vitamin C PowderLamberts Healthcare (Nature's Best) · 1 g a serving · £1.50 a month · a pack lasts 8 months5p£12.50View at Lamberts Healthcare (opens in a new tab)
This productHealf · 250 mg a serving · £131.00 a month · a pack lasts 15 days£4.37shown above

Ranked purely by price per 1 g. 950 combination products also contain vitamin C.

How it compares: vitamin D3

All 207, ranked →
WeightWorldHigh-Strength Vitamin D3 TabletsCheapest per 1,000 IUWeightWorld · 4,000 IU a serving · 17p a month · a pack lasts 4.4 years1p£8.99View at WeightWorld (opens in a new tab)
ZipVitVitamin D3 4000iuZipVit · 4,000 IU a serving · 17p a month · a pack lasts 4 years1p£8.49View at ZipVit (opens in a new tab)
WeightWorldVitamin D3 + K2 (MK7) TabletsWeightWorld · 4,000 IU a serving · 21p a month · a pack lasts 4 years1p£9.99View at WeightWorld (opens in a new tab)
This productHealf · 1,000 IU a serving · £32.75 a month · a pack lasts 2 months£1.09shown above

Ranked purely by price per 1,000 IU. 439 combination products also contain vitamin D3.

How it compares: zinc citrate

All 17, ranked →
Zinc 15mg 180 Tablets (6 month supply)Cheapest per 15 mg zincBoots · 15 mg a serving · £1.29 a month · a pack lasts 6 months4p£7.75View at Boots (opens in a new tab)
Zinc 15mgLamberts Healthcare (Nature's Best) · 15 mg a serving · £1.33 a month · a pack lasts 6 months4p£7.95View at Lamberts Healthcare (opens in a new tab)
Zinc Tablets 15mgSimply Supplements · 15 mg a serving · £1.33 a month · a pack lasts 6 months4p£7.99View at Simply Supplements (opens in a new tab)
This productHealf · 7.5 mg a serving · £65.50 a month · a pack lasts 30 days£2.18shown above

Ranked purely by price per 15 mg zinc. 201 combination products also contain zinc.

On the label

N-Acetyl Cysteine · NAC
450 mg per serving (stated on the label)
Elderberry · Elderberry extract
200 mg per serving (extract weight stated on the label)
Pack
120 capsules · 60 servings · 2 capsule(s) a serving
Cost per serving
£1.09 (60 servings in the pack)
More label details
Quercetin · Quercetin
25 mg per serving (stated on the label)
Vitamin C · Standard (ascorbic acid and ascorbates)
250 mg per serving (stated on the label)
Vitamin D3 · Vitamin D3
1,000 IU per serving (stated on the label)
Zinc · Citrate
7.5 mg per serving (stated on the label)
Claimed on the listing
vegetarian
Sold by
Healf
What the listing says
“120 caps” · “Serving Size: 2 capsules” · “Elderberry (Sambucus nigra) Fruit Extract ; 200 mg”
Ingredients

N-Acety-L-Cysteine (Free-Form), Vitamin C (as Ascorbic Acid), Epicor® Dried Yeast Fermentate Complex (from Saccharomyces Cerevisiae), Elderberry (Sambucus nigra) Fruit Extract, Quercetin, Zinc (as Zinc Citrate), Vitamin D3 (as Cholecalciferol) (1000 IU), Antioxidant (Ascorbyl Palmitate), Vegetarian Capsule (Hydroxypropyl Methylcellulose)

From the Healf listing. Check the pack itself if you have an allergy: labels mark allergens in bold.

Is something wrong? Tell us

Add to your basket

View basket

Your basket prices everything you take together: whole packs, delivery included, from as few websites as you like.

One 600 mg dose is our comparison unit, not a recommendation.

Price history

2 price changes since 1 October 2026. Checked on 20 days, most recently 20 October 2026.

Lowest recorded
£65.509 Oct
Highest recorded
£76.601 Oct
First recorded
£76.601 Oct
Checked on
20 dayssince 1 Oct
Pack price at each check.
  1. Down at Healf: £69.62 → £65.50 (−5.9%)
  2. Down at Healf: £76.60 → £69.62 (−9.1%)
  3. First checked at Healf: £76.60

Questions about this product

How much does Pure Encapsulations PureDefense cost per 500 mg?

£2.73 per 500 mg, from £65.50 for 120 capsules at Healf, checked on 20 October 2026.

How long does one pack last?

24 days at one 500 mg dose. The pack holds 12 g in total.

How much does Pure Encapsulations PureDefense cost per 600 mg?

£1.46 per 600 mg, from £65.50 for 120 capsules at Healf, checked on 20 October 2026.

How long does one pack last?

45 days at one 600 mg dose. The pack holds 27 g in total.

How much does Pure Encapsulations PureDefense cost per 500 mg?

£21.83 per 500 mg, from £65.50 for 120 capsules at Healf, checked on 20 October 2026.

How long does one pack last?

3 days at one 500 mg dose. The pack holds 1.5 g in total.

How much does Pure Encapsulations PureDefense cost per 1 g?

£4.37 per 1 g, from £65.50 for 120 capsules at Healf, checked on 20 October 2026.

How long does one pack last?

15 days at one 1 g dose. The pack holds 15 g in total.

How much does Pure Encapsulations PureDefense cost per 1,000 IU?

£1.09 per 1,000 IU, from £65.50 for 120 capsules at Healf, checked on 20 October 2026.

How long does one pack last?

2 months at one 1,000 IU dose. The pack holds 60,000 IU in total.

How much does Pure Encapsulations PureDefense cost per 15 mg zinc?

£2.18 per 15 mg zinc, from £65.50 for 120 capsules at Healf, checked on 20 October 2026.

How long does one pack last?

30 days at one 15 mg dose. The pack holds 450 mg in total.

About Pure Encapsulations

All 135 Pure Encapsulations products, priced per dose

More from Pure Encapsulations

Keep comparing

All N-Acetyl CysteineEvery form, cheapest per 600 mg firstN-Acetyl Cysteine guideWhat it is, why people take it, how the forms differPure EncapsulationsAll 135 products from this brand, per doseAmino acids & derivativesEverything else we price in this categoryN-Acetyl Cysteine price historyEvery N-Acetyl Cysteine product's price per dose and price historyBuild a basketThe cheapest way to buy several at onceHow we compareWhere every number on this page comes from