30C is a homeopathic potency label that describes how many times a remedy has been diluted and shaken. The "C" means each step is a 1-in-100 dilution, and the "30" means that step was repeated thirty times. It is one of the most widely used potencies in home homeopathy.
This article explains what the number and the letter stand for, how a 30C remedy is prepared, why homeopaths favor it for everyday use, and how it compares with other common potencies.
The short version: 30C means a remedy diluted 1-in-100, thirty times over, with vigorous shaking at each step.
What do the number and the letter mean?
In a potency code, the letter tells you the dilution ratio and the number tells you how many times that ratio was applied. "C" stands for centesimal, from the Latin for hundred, so each stage mixes one part of the previous liquid with ninety-nine parts of fresh water or alcohol.
- The 30 is the number of dilution-and-succussion steps performed.
- The C is the scale: one part remedy to ninety-nine parts diluent at every step.
- Together, 30C describes a substance taken through thirty successive 1:100 stages.
How is a 30C remedy made?
A homeopath starts with a mother tincture or a triturated starting material. One drop is added to ninety-nine drops of diluent, then the vial is struck firmly against a resilient surface many times — a step called succussion. That gives a 1C. A drop of the 1C is taken into fresh diluent and shaken again for 2C, and the cycle repeats until 30C is reached.
Because of this repeated dilution, very little or none of the original starting material remains measurable at 30C. Homeopathy holds that the preparation process itself is what matters, a premise that mainstream science regards as unproven and continues to debate.
Why is 30C so commonly used?
Practitioners often describe 30C as a versatile middle-ground potency: high enough to be considered well-developed in the homeopathic sense, yet gentle and forgiving for self-selected home use. It is a frequent choice for acute, everyday situations in over-the-counter kits.
If you want to browse how finished remedies are presented and labeled, you can explore the range at our full collection and see potencies noted on the packaging.
Common questions
Is a higher number like 200C stronger than 30C?
In homeopathic thinking, higher numbers are considered "higher" potencies and are often reserved for practitioner guidance, while lower numbers like 6C or 30C are common for home use. "Stronger" does not mean more concentrated — it is more diluted.
Does 30C contain any of the original substance?
At 30C the dilution is so extensive that little or no measurable original material typically remains. Homeopathy attributes the effect to the preparation method rather than to a measurable dose.
How is 30C different from 30X?
The letter is the difference. C uses a 1-in-100 dilution at each step; X uses a 1-in-10 dilution. So 30X has been diluted far less than 30C for the same number of steps.
Note: This article is for general education and is not medical advice. Homeopathic remedies are used within a tradition of self-care; they are not a substitute for professional diagnosis or treatment. If symptoms are severe, persistent or worsening, please speak to a qualified health professional.