HAWTHORN
Source: 
Berries, flowers, leaves.
Content: 
Anthocyanin-type pigments, choline, citric acid, cratagolic acid, flavone, flavonoids, folic acid, glycosides, inositol, pantothenic acid, para-aminobenzoic acid, purines, saponins, sugar, tartaric acid, vitamins B1 (thiamine), B2 (riboflavin), B3 (niacin), B6 (pyridoxine), B12, and C.
Uses: 
Recommended for: anemia, cardiovascular and circulatory disorders, immune system, dilating coronary blood vessels, cholesterol, and heart muscle.

HOPS
Source: 
Berries, flowers, leaves.
Content: 
Asparagine, choline, essential oil, humulene, inositol, lupulin, lupulinic acid, lupulon, manganese, para-aminobenzoic acid, picric acids, resin, vitamin B6 (Pyridoxine).
Uses: 
Helpful for: anxiety, cardiovascular disorders, hyperactivity, insomnia, nervousness, pain, restlessness, sexually transmitted diseases, shock, stress, toothaches, ulcers.

HOREHOUND
Source: 
Flowers, leaves.
Content: 
B-complex vitamins, essential fatty acids, essential oils, iron, marrubiin, potassium, resin, tannins, vitamins A, C, and E.
Uses: 
Recommended for: hay fever, sinusitis, respiratory disorders, bronchial tubes and lungs. Boosts the immune system.

HORSETAIL
(bottle brush, shavegrass)
Source: 
Stems.
Content: 
Aconitic acid, calcium, copper, equisitine, fatty acids, fluorine, nicotine, pantothenic acid, para-aminobenzoic acid, silica, sodium, starch, zinc.
Uses: 
Diuretic. Recommended for: arthritis, bone diseases such as osteoporosis and rickets, bronchitis, cardiovascular disease, edema, gallbladder disorders, inflammation, muscle cramps, and prostate disorders. Increases calcium absorption, promotes healthy skin, strengthens bone, hair, nails, and teeth. Promotes healing of broken bones and connective tissue. Used in poultice form to depress bleeding and accelerate healing of burns and wounds. Strengthens the heart and lungs.

HYDRANGEA
Source: 
Roots. (Leaves contain cyanide and can be toxic.)
Content: 
Essential oil, hydrangin, resin, saponin
Uses: 
Diuretic. Recommended for bladder infection, kidney disease, obesity, and prostate disorders. Combined with gravel root, good for kidney stones.

HYSSOP
Source: 
Aerial parts.
Content: 
Diosmine, essential oil, flavonoids, marrubin, tannins.
Uses: 

Recommended for: circulatory problems, epilepsy, fever, gout, weight problems, congestion, blood pressure, and dispelling gas. Used externally, helpful for wound healing. Poultices made from fresh green hyssop help to heal cuts.