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Milk Thistle vs Vitamin B12 — Which Should You Take?

Milk Thistle

herbs

Typically £8–£25/month

Vitamin B12

vitamins

Typically £8–£25/month
Feature
Milk Thistle
Vitamin B12
Typical Dosage
150-300 mg silymarin daily
500-1,000mcg daily
Best Form
standardised extract
Methylcobalamin
Key Benefits
5 listed
5 listed
Evidence Rating
★★★★★
★★★★
Best Time
with meals for better absorption
Morning — may be energising
Upper Limit
600 mg daily
No established upper limit (water-soluble)
Side Effects
4 noted
2 noted

Milk Thistle Benefits

liver support
antioxidant activity
bile production
detoxification support
anti-inflammatory properties

Vitamin B12 Benefits

Energy production
Nerve function and protection
Red blood cell formation
DNA synthesis
May reduce homocysteine levels

Milk Thistle Side Effects

mild gastrointestinal upset
allergic reactions (rare)
headache
loss of appetite

Vitamin B12 Side Effects

Very safe — excess excreted in urine
Rare: acne at very high doses in some individuals

Can You Take Milk Thistle and Vitamin B12 Together?

In most cases, Milk Thistle and Vitamin B12 can be taken together safely. However, always check the interactions section of each supplement and consult a healthcare professional if you take medication or have existing health conditions.

Milk Thistle: may interact with drugs metabolised by CYP3A4

Milk Thistle: potential interaction with statins

Vitamin B12: Metformin reduces B12 absorption — supplement if on metformin

Vitamin B12: Proton pump inhibitors (PPIs) reduce absorption

Which Should You Choose?

Choose Milk Thistle if your primary goal is: liver support. Choose Vitamin B12 if your primary goal is: energy production.

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Frequently Asked Questions

Is Milk Thistle better than Vitamin B12?

It depends on your goals. Milk Thistle and Vitamin B12 serve different purposes and are often taken together.

Can I take Milk Thistle and Vitamin B12 together?

In most cases, yes. Milk Thistle and Vitamin B12 can be taken together safely. However, always check for specific interactions and consult a healthcare professional if you take medication.

What is the best time to take Milk Thistle?

with meals for better absorption

What is the best time to take Vitamin B12?

Morning — may be energising

What are the side effects of Milk Thistle?

mild gastrointestinal upset. allergic reactions (rare). headache. loss of appetite.

What are the side effects of Vitamin B12?

Very safe — excess excreted in urine. Rare: acne at very high doses in some individuals.

How We Compare Supplements

This comparison is based on published clinical research, peer-reviewed studies from PubMed, and established nutritional science. We evaluate dosages based on clinically-effective amounts, not manufacturer recommendations. Benefits listed have at least moderate evidence from human studies. When evidence is limited or conflicting, we note this.

Disclaimer: This comparison is for educational purposes only and is not medical advice. Always consult a qualified healthcare professional before starting any supplement, especially if you take medication or have existing health conditions.

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