White tea, like green tea, is derived from the plant Camellia sinensis, a member of the Theaceae family and the source of all the globally popular “true tea” beverages.
Of the four main true teas, green and white are unfermented (white is the least processed), black tea is fermented, and oolong tea is semifermented.1,2,3 White tea actually comes from the tips of the green tea leaves or leaves that have not yet fully opened, with buds covered by fine white hair. As a commodity, white tea is more expensive than green tea because it is more difficult to obtain. EGCG [(-)epigallocatechin-3-O-gallate], the most abundant and biologically active polyphenolic catechin found in green tea, is also the constituent in white tea that accounts for its antioxidant properties.4,5 Indeed, white tea is included in topical products for its antioxidant as well as antiseptic activity, and is considered a more potent antioxidant additive medium than green tea.6,1
As an ingredient in a combination formula
White tea is included in the dietary supplement Imedeen Prime Renewal, along with fish protein polysaccharides, vitamins C and E, zinc, and extracts from soy, grape seed, chamomile, and tomato.
Dr. Leslie S. Baumann
In 2006, Skovgaard et al. conducted a 6-month, double-blind, placebo-controlled randomized study on 80 healthy postmenopausal women (38 in the treatment group, 42 in the placebo group completed the study) to determine antiaging effects on the skin. Subjects took 2 tablets of the supplement or placebo twice daily. Clinical, photo, and ultrasound evaluations showed significantly greater improvements in the treatment group, compared with the placebo group, in the face (forehead, periocular, and perioral wrinkles; mottled pigmentation, laxity, sagging, dark circles under the eyes; and overall appearance), hands, and décolletage.7
Antioxidant and antiaging activity
In 2009, Thring et al. studied the antiaging and antioxidant characteristics of 23 plant extracts (from 21 species) by considering antielastase and anticollagenase activities. White tea was found to exhibit the greatest inhibitory activity against both elastase and collagenase, greater than burdock root and angelica in terms of antielastase activity, and greater than green tea, rose tincture, and lavender in relation to anticollagenase activity. The Trolox equivalent antioxidant capacity assay also showed that white tea displayed the highest antioxidant activity. The investigators noted the very high phenolic content of white tea in characterizing its potent inhibitory activity against enzymes that accelerate cutaneous aging.6
Earlier in 2009, Camouse et al. examined skin samples from volunteers or skin explants treated with topical white or green tea after ultraviolet exposure to ascertain that the antioxidant could prevent simulated solar radiation–induced damage to DNA and Langerhans cells. They noted that each product displayed a sun protection factor of 1, suggesting that the photoprotection conferred was not due to direct UV absorption. Both forms of topically applied tea extracts were equally effective and judged by the researchers to be potential photoprotective agents when used along with other substantiated approaches to skin protection. These findings provided the first reported evidence of topically applied white tea preventing UV-induced immunosuppression. The researchers further suggested that the color of white tea might render it more cosmetically desirable than green tea.8
It should be noted that a systematic review performed by Hunt et al. in 2010 of MEDLINE, Embase, CINAHL (Cumulative Index to Nursing and Allied Health Literature), CENTRAL (Cochrane Central Register of Controlled Trials), and AMED (Allied and Complementary Medicine Database) databases up to 2009 identified 11 randomized clinical or controlled clinical trials evaluating the effectiveness of botanical extracts for diminishing wrinkling and other signs of cutaneous aging. No significant reductions in wrinkling were associated with the use of green tea or Vitaphenol (a combination of green and white teas, mangosteen, and pomegranate extract). The authors noted, however, that all of the trials that they identified were characterized by poor methodologic quality.9
Thring et al. conducted an in vitro study in 2011 to evaluate the antioxidant and anti-inflammatory activity of white tea, rose, and witch hazel extracts in primary human skin fibroblasts. The investigators measured significant anticollagenase, antielastase, and antioxidant activities for the white tea extracts, which also spurred a significant reduction in the interleukin-8 amount synthesized by fibroblasts, compared with controls. They concluded that white tea (as well as the other extracts) yielded a protective effect on fibroblasts against damage induced by hydrogen peroxide exposure.10
In 2014, Azman et al. used the spin trap method and electron paramagnetic resonance (EPR) spectroscopy to show that among white tea constituents, EGCG and epicatechin-3-gallate (ECG) exhibit the greatest antiradical activity against the methoxy radical.1