Juice Plus+ Products: Clinical Overview
Juice Plus+ products are encapsulated fruit, vegetable, and berry juice powder concentrates that are classified as dietary supplements and therefore lack FDA premarket approval for safety or efficacy; while some studies show they can increase plasma concentrations of certain vitamins and carotenoids, they are not recommended for disease prevention or treatment, and patients should be counseled that whole fruits and vegetables are superior nutritional sources.
Regulatory Status and Safety Concerns
Juice Plus+ falls under the category of dietary supplements, which means 1:
- No premarket FDA approval required for safety or efficacy
- No proof of efficacy required before marketing
- Manufacturing standards are less stringent than FDA-approved medications
- Risk of unknown contaminants that could cause organ toxicity
- No FDA quality control testing data submission required
This regulatory gap is critical because patients often assume dietary supplements undergo the same rigorous testing as prescription medications, which is false 1.
Product Composition and Dosing
Based on available research, typical Juice Plus+ formulations provide 2, 3:
Standard daily dosing (6 capsules/day for 8 weeks):
- β-carotene: 2.91 mg
- Vitamin A: 490 μg
- Vitamin E: 18.7 mg
- Vitamin C: 159 mg
- Lutein: 6.1 mg
- Lycopene: 1 mg
Omega blend formulation (2 capsules/day):
- 925 mg blend of algae-derived omega-3, -7, and -9 fatty acids 4
Evidence of Bioavailability
The most robust finding is that Juice Plus+ can increase plasma concentrations of certain micronutrients in healthy subjects 2:
- α-carotene increased from 59.6 to 85.7 nmol/L (p=0.002)
- β-cryptoxanthin increased from 106.7 to 151.9 nmol/L (p=0.017)
- Lycopene increased from 1.2 to 1.7 μmol/L (p=0.005)
- Vitamin C increased from 70 to 90 μmol/L (p<0.001)
- All-trans retinol increased from 1.99 to 2.30 μmol/L (p=0.015)
However, these increases leveled off around the upper limit of normal reference ranges, suggesting no additional benefit beyond nutritional adequacy 2.
Clinical Efficacy Claims: What the Evidence Shows
For General Health and Disease Prevention
The evidence is clear: dietary supplements including Juice Plus+ are NOT recommended for disease prevention 5, 6, 7, 8:
- No clear evidence that dietary supplementation with vitamins, minerals, herbs, or spices improves outcomes in people without underlying deficiencies 5, 6, 7, 8
- Not recommended for glycemic control in diabetes 6, 7, 8
- No benefit for cardiovascular disease or cancer prevention 9
- β-carotene supplementation may actually cause harm in certain populations (smokers, asbestos exposure) 9
Specific Research Findings on Juice Plus+
Limited studies show modest effects in specific populations:
- Common cold symptoms: 20% reduction in moderate/severe symptom days in healthcare workers (7.6 vs 9.5 days, p=0.023) 10
- Skin microcirculation: 39% increase in superficial plexus microcirculation after 12 weeks in middle-aged women 11
- Menopausal symptoms: 44% improvement in overall symptom scores, particularly psychological symptoms 12
- Adolescent cognition: Improved episodic memory and attention in 13-14 year-olds with omega blend 4
Critical caveat: These studies are small, industry-associated, and lack the rigor of FDA-approved drug trials. They do not establish clinical benefit for morbidity or mortality.
What Patients Should Know Instead
Superior Alternative: Whole Foods
Guidelines consistently recommend whole fruits and vegetables over supplements or juices 6, 7, 8:
- Replace fruit juices (including Juice Plus+) with water as much as possible 7, 8
- Avoid sugar-sweetened beverages and fruit juices to control glycemia, weight, and reduce cardiovascular disease risk 6, 7, 8
- Emphasize minimally processed, nutrient-dense, high-fiber sources of carbohydrates 8
- At least 5 servings daily of whole fruits and vegetables 13
Why Whole Foods Are Better
- Juicing removes fiber, making products less filling 13
- Whole fruits provide better satiety and glycemic control 14
- Fruit juice consumption is associated with weight gain and tooth decay in children 15
- Water is the predominant component of juice, with limited additional nutritional value beyond what whole foods provide 14
Drug Interactions
Fruit-based supplements can interact with medications 14:
- Flavonoids in fruit concentrates can decrease activity of cytochrome P450 3A4 (CYP3A4)
- May increase bioavailability of drugs metabolized by CYP3A4
- Consider the amount and type of supplement when evaluating potential interactions
- Always inquire about supplement use during medication reviews 8
Clinical Recommendations
When patients ask about Juice Plus+:
Counsel that dietary supplements are not FDA-approved and lack proof of safety or efficacy 1
Recommend whole fruits and vegetables instead, emphasizing at least 5 servings daily 13
Advise replacing all fruit juices with water to optimize metabolic health 7, 8
Screen for underlying nutritional deficiencies if supplementation is being considered; targeted supplementation for documented deficiencies is appropriate 5, 6
Document all supplement use in the medical record and assess for potential drug interactions 8, 16
For specific populations with documented deficiencies (pregnant women needing folic acid, elderly at risk for falls needing vitamin D), use evidence-based, targeted supplementation rather than broad-spectrum products 9
Safety Monitoring
If patients insist on using Juice Plus+ despite counseling:
- Monitor for adverse effects, particularly hepatic or renal toxicity given lack of quality control 1
- Review all concurrent medications for potential interactions 14
- Reassess nutritional status and redirect toward whole food sources 8
- Report any serious adverse events to FDA MedWatch 1
The bottom line: Juice Plus+ may increase certain plasma micronutrient levels in healthy individuals, but this does not translate to improved clinical outcomes, and whole fruits and vegetables remain the evidence-based recommendation for optimal nutrition and disease prevention 1, 6, 7, 8, 13, 9.