Arnica Potencies EXPLAINED

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Numbers, Letters... What do they all mean?

If you’ve ever found yourself staring at a packet of Arnica wondering what on earth 6C, 30C, or 200C actually means, you’re not alone.

This is one of the most common points of confusion I see when owners explore Arnica for their dogs, particularly after physical stress such as surgery, injury, or whelping.
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This article isn’t here to tell you what to give your dog, or how much. Instead, it’s designed to explain the language around Arnica so you can understand what people are referring to when they discuss different potencies, and why opinions vary so widely.

Which Arnica we’re actually talking about

When Arnica is discussed in dog circles, it is almost always referring to homeopathic Arnica, not herbal Arnica.
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Herbal Arnica is made directly from the Arnica montana plant and is not suitable for internal use in dogs. It is regulated differently and should not be confused with homeopathic preparations.
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Homeopathic Arnica is prepared using repeated dilution and agitation, and it is this form that people are usually referring to when they talk about Arnica for dogs.

​What do the numbers and letters actually mean?

Homeopathic remedies are labelled very differently to supplements or medications.

You’ll commonly see Arnica labelled as 6C, 30C, or 200C.

Here’s what that means in simple terms.

• The letter “C” refers to the centesimal scale. This means the original substance is diluted at a ratio of 1 part to 100 parts liquid at each step.
• The number tells you how many times that dilution process has been repeated.

So, for example:

• 6C has gone through six rounds of dilution
• 30C has gone through thirty
• 200C has gone through two hundred

In homeopathic theory, a higher number does not mean a higher dose or a stronger substance in the way supplements or medicines work. It reflects a different level of dilution and preparation, not quantity. This difference in logic is one of the main reasons Arnica can feel so confusing.

What does each potency 'do'?

Here's a general overview of which potencies are traditionally discussed for which reasons. This is not instruction or recommendation.

Broadly speaking, in homeopathic practice:

• Lower potencies (such as 6C) are often discussed in relation to more physical, tissue-level concerns.
• Mid-range potencies (such as 30C) are commonly talked about as more general or acute support.
• Higher potencies (such as 200C) are often associated with deeper or more significant events and are typically used less frequently.

This is not a rulebook, and it is not something that translates neatly into “bigger number equals better”. It is simply how practitioners of homeopathy tend to conceptualise different potencies.
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This is also why advice online can sound contradictory. People are often speaking from very different frameworks.

Arnica after whelping, surgery, or physical trauma

Events like whelping, C-sections, or other surgeries place significant physical demands on the body. Because Arnica is traditionally associated with bruising, trauma, and physical strain, it’s common for owners to ask whether it has a role during recovery. If you want to read more about post-whelp support, check out this blog here.

That’s why questions about potency often come up at this stage.
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However, Arnica is never a replacement for veterinary care, pain relief, or appropriate post-operative management. It sits as supportive, alongside rest, observation, nutrition, and veterinary guidance.

Why there isn’t a single 'right' type of Arnica

You’ll notice I don’t give specific potency or dosing advice for Arnica, and that’s deliberate.

Homeopathy does not follow standardised dosing in the way nutrition or medicine does. Different manufacturers, practitioners, and traditions offer different guidance, and there is no single, universally accepted approach for dogs.
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If someone wants tailored homeopathic guidance, a qualified veterinary homeopath is the right person to provide it. My role is to help you understand the landscape, not to issue instructions.

This question doesn’t have a single answer...

If you’re asking whether '200C is okay for post-whelp support', what you’re really asking is whether that potency is something people commonly refer to in homeopathic practice... The answer is yes, it is one of the potencies you’ll see discussed.

But understanding what it represents is far more important than chasing a number. Clarity beats guesswork every time.

If you’d like to understand how Arnica fits into post-whelp recovery more broadly, you can read our dedicated article on Arnica after whelping, where we focus on recovery priorities and the bigger picture.

And if you ever feel unsure about your dog’s recovery, or something doesn’t sit right, trust your instinct and ask your vet. 

If you'd like more tailored guidance post-whelp, feel free to put a CoachingCall in my diary.

Wishing you and your girl the best of health, 

Isobel x