Defender by Beast Labs Nutrition is a capsule supplement that combines NAC, TUDCA, milk thistle and schizandra with vitamin E, zinc, selenium and vitamin B12. A 2-capsule serve lists 500 mg NAC, 250 mg TUDCA and 200 mg milk thistle, and a 120-capsule bottle gives 60 serves. Beast Labs markets it as liver support for adults who want these ingredients in one product. Shop Defender by Beast Labs.
At a glance
| Detail | Defender by Beast Labs |
|---|---|
| Brand | Beast Labs Nutrition |
| Type | Capsule supplement, sold by the brand as "Premium Liver Support" |
| Serve size | 2 capsules |
| Key actives per serve | N-acetyl cysteine (NAC) 500 mg; TUDCA 250 mg; schizandra fruit extract 200 mg (standardised to 2% schizandrin); milk thistle 200 mg (80% silymarin); plus vitamin E, zinc gluconate 6 mg, selenium (as selenomethionine) 75 mcg and vitamin B12 50 mcg |
| Servings / sizes we list | 120 capsules, 60 serves |
| Flavours we list | Not applicable (capsules) |
| Dietary notes | Gelatin capsule, so not suitable for vegetarians or vegans. Other ingredients: magnesium stearate, anti-caking agent (551), colour (142). |
What is in Defender
Defender is a supplement, not a treatment for any liver condition. Here is what each main ingredient is and what independent sources say.
N-acetyl cysteine (NAC), 500 mg. The Australian Institute of Sport (AIS) describes NAC as an amino acid and powerful antioxidant that acts as a cysteine donor, supporting the body's glutathione levels. The AIS places NAC in Group B of its Sports Supplement Framework, meaning emerging or mixed scientific support. Its athlete fact sheet also says NAC is not recommended for habitual use or for periods longer than one month, that mega-dosing antioxidants can potentially inhibit adaptations to exercise, and that NAC is anecdotally best taken with food to reduce stomach upset.
TUDCA, 250 mg. Tauroursodeoxycholic acid is a bile acid: the taurine-linked form of ursodeoxycholic acid, according to the NIH PubChem database. It is not rated in Groups A to C of the AIS framework, so treat any benefits claimed for it as the brand's claims.
Milk thistle (80% silymarin), 200 mg. Silymarin is the main group of compounds in milk thistle extract. The US National Center for Complementary and Integrative Health (NCCIH) says there is not enough high-quality evidence to draw definite conclusions about milk thistle, and that clinical trials for liver diseases have been conflicting or too limited to reach conclusions. It appears well tolerated, with digestive symptoms such as bloating, nausea and gas the most common side effects.
Schizandra fruit extract, 200 mg. Standardised to 2% schizandrin. It is not rated in Groups A to C of the AIS framework either, so its role in the formula is the brand's claim.
Vitamins and minerals. The panel also lists vitamin E, zinc gluconate (6 mg), selenium as selenomethionine (75 mcg) and vitamin B12 (50 mcg). If you take a multivitamin as well, check your combined totals.
Who it suits
- Adults who want NAC, TUDCA and milk thistle in one product instead of buying them separately
- People who are happy with a 2-capsule serve
- People who have already checked with their doctor or pharmacist that the ingredients suit them
- Those who do not need a vegetarian capsule
Who should check first
- Liver or gallbladder conditions, or symptoms: see your GP. Do not use a supplement in place of medical care.
- Taking any medicine: NCCIH notes that some herbs and medicines interact in harmful ways, so ask your doctor or pharmacist first. NCCIH also mentions research on milk thistle and blood sugar in type 2 diabetes, so check before use if you take diabetes medicine.
- Pregnant or breastfeeding: NCCIH says little is known about whether milk thistle is safe during pregnancy or breastfeeding.
- Under 18: talk to your doctor first.
- Plant allergies: NCCIH says milk thistle can cause allergic reactions, especially in people allergic to related plants such as ragweed, chrysanthemum, marigold and daisy.
- Vegetarians and vegans: the capsule is gelatin.
- Already taking NAC: add up your total so you do not double up.
- Drug-tested athletes: Beast Labs' product page does not state a HASTA or Informed Sport certification. Sport Integrity Australia says no supplement can fully guarantee you will not test positive, so check its guidance and the certifier databases yourself. See our guide to supplements for drug-tested athletes.
How to use Defender
The label serve is 2 capsules, with 60 serves per bottle. Beast Labs' product page does not publish further directions, so follow the directions printed on your bottle or your healthcare professional's advice, and do not exceed the label serve. Taking it with a meal is a sensible way to reduce the chance of stomach upset, in line with the AIS's anecdotal note on NAC.
If you train for performance, keep the AIS guidance in mind: its framework for athletes does not recommend NAC for habitual use or for longer than one month. A sports dietitian can help you decide whether NAC fits your training.
How it compares
- Beast Labs Nutrition NAC 1000mg: a single-ingredient tablet with 1,000 mg of NAC each, double Defender's per-serve amount, with a vegetarian coating.
- Beast Labs Nutrition TUDCA 250mg: the same 250 mg of TUDCA per serve, but on its own in one vegetarian capsule, with 60 serves per bottle.
- Milk Thistle by Primabolics: a single-ingredient vegetarian capsule with 600 mg of milk thistle in each.
Single-ingredient products make it easier to see and control exactly what you take, while Defender suits people who prefer one combined product. Our supplements guide and supplement finder can help you compare.
Where to buy Defender by Beast Labs in Melbourne and Australia
You can buy Defender by Beast Labs online at Supps247 with Australia-wide delivery (see our shipping and returns page), or order online and pick it up from one of the 11 Supps247 stores that offer click and collect. Supps247 has 18 stores, 17 in Victoria plus Richlands in Queensland, so use the store locator to find your nearest. Staff in store can help you compare capsule labels side by side.
Seen it cheaper elsewhere? Check our price match guarantee. Conditions apply.
FAQs
What is in Defender by Beast Labs?
Each 2-capsule serve lists 500 mg NAC, 250 mg TUDCA, 200 mg schizandra fruit extract and 200 mg milk thistle (80% silymarin), plus vitamin E, zinc gluconate, selenium and vitamin B12. The capsule shell is gelatin.
How many Defender capsules should I take?
The label serve is 2 capsules. With 120 capsules per bottle, that is 60 serves. Follow the directions on your bottle and do not exceed the label serve.
Is Defender vegetarian?
No. The label lists gelatin as the capsule material, so it is not suitable for vegetarians or vegans. The single ingredient NAC, TUDCA and milk thistle products above use vegetarian capsules or coatings.
Does milk thistle work for the liver?
The evidence is not clear. NCCIH says clinical trials of milk thistle for liver diseases have been conflicting or too limited to draw conclusions. Defender is not intended to treat any liver condition, so see your doctor if you have concerns.
Can I take Defender with medication?
Ask your doctor or pharmacist first. NCCIH warns that some herbs and medicines interact in harmful ways, and Defender contains several active ingredients.
Label details checked against the official Beast Labs Nutrition product page and the Defender label panel on 19 October 2026. Formulas can change, so always read the label on the product you buy and follow the directions.
Sources: Beast Labs Nutrition, Defender Premium Liver Support; Defender supplement facts label panel; Australian Institute of Sport, N-acetylcysteine; Australian Institute of Sport, Sports Supplement Framework fact sheet: NAC; Australian Institute of Sport, Sports Supplement Framework Group B; Australian Institute of Sport, Group A; Australian Institute of Sport, Group C; NIH PubChem, Tauroursodeoxycholic acid; NCCIH, Milk Thistle: Usefulness and Safety; Sport Integrity Australia, Supplements in sport
