The distinctly "warming" character from the red pepper extract is part of the formula's intended care effect, designed to invigorate the root area and bring a feeling of freshness. This sensation is a sign the shampoo is working as formulated, not necessarily an indicator of excessive strength. However, the product's own guidance notes that if you have sensitive skin, a tendency to irritation, or a known reaction to warming components, it is better to start carefully and focus on your individual sensations.
A practical approach is to perform a patch test before full use: apply a small amount to your wrist or behind your ear and wait 24 hours. When using it for the first time, apply a smaller than usual amount (about the size of a 10-cent coin) and massage it gently into the scalp. If the warming feeling is intense but not uncomfortable, it is likely working as intended. If it becomes unpleasant or causes significant redness or itching, rinse immediately. You can adjust frequency, using it every other wash or mixing it with a milder shampoo to dilute the effect. Always follow with a conditioner on the lengths to balance the routine.