Studies related to Rate of Sickness and Garlic

Preventing The Common Cold With A Garlic Supplement: A Double-blind, Placebo-controlled Survey

Effect Decrease
Trial Design Double blind
Trial Length 1-6 months
Number of Subjects 146
Gender Both Genders
Age Range 30-44, 45-64
Notes for this study:
Supplementation of garlic powder (180mg allicin) over the course of twelve weeks noted that the supplementation group recovered from sickness faster (1.52 days of sickness relative to 5.02 in placebo) and experienced sickness at a lower rate (111 cumulative sick days, relative to 366 in placebo), suggesting immunity from the common cold by reducing both length and occurrence by 70%.

Supplementation With Aged Garlic Extract Improves Both NK And γδ-T Cell Function And Reduces The Severity Of Cold And Flu Symptoms: A Randomized, Double-blind, Placebo-controlled Nutrition Intervention

Effect Decrease
Trial Design Double blind
Trial Length 1-6 months
Number of Subjects 120
Gender Both Genders
Age Range 18-29, 30-44, 45-64
Body Types Average
Notes for this study:
Supplementation of 2.56g of aged garlic extract to otherwise healthy persons for 90 days was associated with increases in natural killer cells and γδ-T cells in serum (2-fold and 8-fold, respectively), and this was associated with a significantly reduced risk of developing sickness and a lesser decrease in symptoms.

Glutathione in PBMCs was noted to be increased in the garlic group but not control.
Funding issues for this study:
Funded by Kyolic's producers