Herbs are then capable of accelerating or decelerating numerous physiological responses within the system depending, of course on which ones are used, how much is used at given time, and the intended length of their use. Not all herbs, of course, are capable of such immediate manifestations. A number of nutritive herbs such as alfalfa, kelp, and slippery elm will promote nourishment but do so in an uneventful way. Nothing will seem too apparent about them until some weeks have passed, at which time their vital roles will become more established. One of the first evidences that they are working is when a particular vitamin, mineral, amino acid or enzyme deficiency is resolved and subtle improvement noticed.
Herbs come in different forms such as teas, tinctures, tablets, capsules, powders, and poultices.
Each form works in a different way for specific health needs. Each form has an advantage of another. Teas work quickly, but heat destroys some of their vitamin content. Alcohol-based tinctures draw out essential oils that none of the other forms can do. Tablets and capsules are very convenient to carry with you and take when travelling somewhere.