Because caffeine is a stimulant, there is a possibility of side effects even when it’s applied topically. As you likely know, caffeine is a stimulant that’s found naturally in many plants (e.g. coffee beans, cocoa beans, tea leaves, etc.). It’s true that Alpecin products contain caffeine. But that’s not the only thing they contain. They also consist of preservatives and detergents that may strip your scalp of its natural oils and ultimately cause further irritation. Conducted at the Clinic for Dermatology and Dermatologic Allergology of the Friedrich-Schiller-University Jena, Germany. T. W. Fischer, U. C. Hipler, P. Elsner, Int. J. Dermatol. 2007, 46, 27–35. Those results are when the researchers used the Per-Protocol (PP) analysis, which does create some bias ( 5).

The stimulant is also used in both prescription and over-the-counter medications to promote alertness and even to treat migraines. This in-vitro study retrieved scalp biopsies from the scalps of 14 men with Androgenetic Alopecia (AGA). The hair follicles were then cultivated in either a concentration of testosterone, a concentration of caffeine, or a combination of both for 120 to 192 hours.Perhaps the most convincing study on the topic was published in 2007 by researchers from Friedrich-Schiller-University in Germany ( 1). There are many customers who claim they began to see less hair shedding in just a few weeks. There are also those who claimed to use the product as directed for months with no results whatsoever. Water, Sodium Laureth Sulfate, Laureth-2, Disodium Laureth Sulfosuccinate, Sodium Lauroyl Glutamate, Sodium Chloride, Taurine, Caffeine, Panthenol, Propylene Glycol, Citric Acid, PEG-120 Methyl Glucose Dioleate, Fragrance, Sodium Citrate, PEG-40 Hydrogenated Castor Oil, Potassium Sorbate, Polyquaternium-7, Sodium Benzoate, Calcium Gluconate, Disodium EDTA, Magnesium Gluconate, Zinc PCA, Hexyl Cinnamal, Niacinamide, Tocopherol, Linalool, Glycine Soja Oil, Limonene, Biotin, Methylparaben, Propylparaben, Sodium Sulfate, Yellow 5, Yellow 6.

The study started with 210 male subjects with AGA. The list of men were randomized and assigned to one of two groups:

Side Effects of Caffeine Shampoo

Alpecin Double-Effect Shampoo in comparison to the leading market reference product against dandruff: However, it’s important to note that the effectiveness of hair care products can vary from person to person, and Alpecin Shampoo may not work for everyone. Conclusion There are a few differences, though perhaps the most noticeable is the addition of propylene glycol in this formulation. Conducted at the clinic and polyclinic for dermatology and venereology at the University of Hamburg-Eppendorf, Germany. J. M. Brandner, M. J. Behne, B. Huesing, I. Moll, Int. J. Cosmet. Sci. 2006, 28, 343–347. EP 1396261 B1. users are happy with the results of this shampoo; it provides good strength to weak hairs and volume to straight hairs.

If you suffer from a cardiovascular or vascular disease, it’s best to avoid caffeine-based hair care products. Caffeine, in its active component complex, aids in the maintenance and stabilization of the scalp’s barrier function.There are three major phases of the hair growth cycle: anagen (active growth), catagen (transition), and telogen (rest).