Green Powder (Greens Blend)
Blended powder of multiple vegetables, grasses, and algae. Used as a convenient option to supplement vegetable intake, but composition varies widely by product and cannot fully replace fresh vegetables.
An ingredient with still-limited research
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Effects reported in research
Convenient way to consume multiple plant-derived phytonutrients at once
Nutritional support when fresh vegetable intake is difficult (travel, busy schedules)
Some products contain prebiotics and probiotics supporting gut health
Dosage & timing
- Follow product-recommended dosage (typically 1–2 scoops/day).
- Mix into water or smoothies.
Cautions
- •Wide composition variation across products — evidence is based on individual ingredients.
- •Check vitamin K content if on anticoagulants.
- •Confirm potassium and oxalate levels for kidney conditions.
Supporting research
Meta-analysis of vitamin C supplementation on immune function and upper respiratory tract infection risk after exercise
American Journal of Clinical Nutrition, 1993
A meta-analysis examining the effects of vitamin C supplementation on upper respiratory tract infection (common cold) risk following intense exercise (marathon, etc.). Vitamin C supplementation reduced upper respiratory infection risk by approximately 50% compared to placebo. In the general population (lower exercise intensity), preventive effects are limited, suggesting the benefit is greatest in specific contexts where intense exercise causes immune suppression. Contributions to neutrophil and lymphocyte function and collagen synthesis are also documented.
Effects of probiotics on gut microbiota, IBS symptoms, and immune function: a meta-analysis
American Journal of Gastroenterology, 2014
A meta-analysis of 43 RCTs. Probiotics significantly improved global IBS symptom scores and abdominal pain compared to placebo (risk ratio 0.79). However, effects varied considerably by strain, with more consistent improvements seen in multi-strain Lactobacillus and Bifidobacterium products. Multiple studies also reported improvements in immune markers, including secretory IgA and inflammatory cytokines.
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