How to treat allergy with activated charcoal?
Against allergy activated charcoal takecourses for 1.5 months. Courses are conducted in the spring (beginning in early April) and in summer. For a year spend at least 2 courses (maximum - 4). Against severe allergy (the first few days), coal is taken in the morning long before meals, at a rate of 1 tablet per 10-11 kg of body weight. Tablets should not be swallowed whole, they need to be chewed or crushed and taken inside, washed down with water. The method with chewing has a charitable effect on the oral cavity and on the nasopharynx. After the allergy is significantly reduced, you should continue taking 1 tablet 2 times a day before the end of the course. Usually the effect appears after the first course. Here, the main thing is not to relax, and to prevent the disease from returning, it will be necessary to conduct repeated courses, at least 2 times a year. If you do not forget about this, the allergy can gradually come to naught. It is necessary to treat allergy with activated charcoal very carefully, not forgetting that along with harmful substances, vitamins, minerals, and other useful substances are adsorbed and removed. So long-term use may be harmful, so if you take coal for a long time, then only in combination with multivitamins. Activated charcoal can also provoke the appearance of constipation. Activated carbon can be used for allergies (for example, atopic dermatitis) in children. In a period of severe itching, you can offer 1 tablet to a child. To treat children should be treated with extreme caution, do not give the drug for more than 10 days in a row due to the same danger of losing vitamins. For children, during a period of intensive growth, the lack of vitamins is especially harmful, it can affect not only growth and development, but also the state of the baby's health. 
In conclusion: is there an alternative?
The reception of such a seemingly harmless drug,as activated charcoal, without clinical trials in the field of its use against allergies can be unsafe. So, think for yourself whether it is worthwhile to engage in self-medication, in the absence of control by a specialist, without conducting clinical and biochemical analyzes, or maybe you should trust a professional who will choose you a comprehensive treatment against allergies. A good alternative to activated charcoal can be garlic, having on the body the same positive effect, it also perfectly strengthens the body's immune system, and also does not cause constipation. Garlic is consumed 3 times a day for 1 slice, making a mush from it: 50 ml of water is added to one crushed garlic clove. Use garlic necessarily after or during meals, so as not to damage the gastric mucosa.
