# Silverskin Garlic (Allium sativum 'Silverskin')

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/silverskin-garlic
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Allium sativum 'Silverskin', Silverskin softneck garlic, Silver-skinned garlic, Artichoke garlic, California Late garlic, Silver Rose garlic, Italian Late garlic, Creole garlic

## Overview

Silverskin garlic (Allium sativum 'Silverskin') is a hardneck garlic variety containing high concentrations of allicin and organosulfur compounds that enhance antioxidant enzyme activity. Clinical studies demonstrate its ability to reduce [oxidative stress](/ingredients/condition/antioxidant) and improve antioxidant capacity in diabetic and menopausal populations.

## Health Benefits

• Enhanced antioxidant capacity: RCT with 20 type 2 diabetes patients showed increased SOD, CAT, and GPx enzymes after 3.6g/day for 30 days (moderate evidence)
• Reduced [oxidative stress](/ingredients/condition/antioxidant): Double-blind RCT with 42 menopausal women found increased total antioxidant capacity and decreased malondialdehyde with 1200μg allicin-equivalent daily for 1 year (moderate evidence)
• [Anti-inflammatory](/ingredients/condition/inflammation) effects: Double-blind RCT with 42 peritoneal dialysis patients showed decreased IL-6, CRP, and ESR with 400mg extract twice daily for 8 weeks (moderate evidence)
• Upregulated immunity genes: Randomized crossover trial with 17 volunteers demonstrated increased expression of NFAM1, ARNT, AHR genes with 5g raw crushed garlic daily for 10 days (moderate evidence)
• [Antiviral](/ingredients/condition/immune-support) properties: RCT with 50 patients showed cure of recalcitrant common warts using lipid garlic extract twice daily for 4 weeks (moderate evidence)

## Mechanism of Action

Silverskin garlic's primary bioactive compound allicin is formed when alliin contacts the enzyme alliinase upon crushing or cutting. Allicin and its metabolites diallyl disulfide and diallyl trisulfide upregulate antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), and [glutathione](/ingredients/condition/detox) peroxidase (GPx) through activation of the Nrf2/ARE pathway. These organosulfur compounds also scavenge [reactive oxygen species](/ingredients/condition/antioxidant) directly and modulate cellular redox homeostasis.

## Clinical Summary

A randomized controlled trial with 20 type 2 diabetes patients showed 3.6g daily silverskin garlic for 30 days significantly increased SOD, CAT, and GPx enzyme levels, providing moderate evidence for [antioxidant](/ingredients/condition/antioxidant) benefits. A separate double-blind RCT with 42 menopausal women demonstrated increased total antioxidant capacity and decreased malondialdehyde levels. While these studies show promising antioxidant effects, the evidence base remains limited with small sample sizes. Additional larger-scale trials are needed to confirm therapeutic potential.

## Nutritional Profile

Silverskin Garlic (Allium sativum 'Silverskin') shares the core nutritional composition of cultivated garlic with some varietal nuances. Per 100g raw bulb (approximate values): Calories: 149 kcal; Carbohydrates: 33g (including fructooligosaccharides/FOS: ~9-16g, functioning as [prebiotic](/ingredients/condition/gut-health)s); Dietary fiber: 2.1g; Protein: 6.4g (containing sulfur-bearing amino acids including alliin ~5-14mg/g fresh weight); Fat: 0.5g. Key micronutrients: Vitamin B6 (pyridoxine): 1.24mg (96% DV); Vitamin C: 31mg (34% DV); Manganese: 1.67mg (73% DV); Selenium: 14.2μg (26% DV); Phosphorus: 153mg (15% DV); Calcium: 181mg (14% DV); Potassium: 401mg (9% DV); Iron: 1.7mg (9% DV); Zinc: 1.16mg. Primary bioactive compounds: Alliin (S-allyl-L-cysteine sulfoxide): 5–14mg/g fresh weight, converted to allicin (diallyl thiosulfinate) upon tissue disruption by alliinase enzyme — allicin yield approximately 2.5–4.5mg/g fresh weight; Allicin degrades rapidly (half-life ~16 hours at room temperature) into diallyl sulfide (DAS), diallyl disulfide (DADS), diallyl trisulfide (DATS), and ajoene. S-allylcysteine (SAC): 0.1–0.4mg/g fresh weight — water-soluble, stable, and considered highly bioavailable (~98% oral bioavailability in animal models); S-allylmercaptocysteine (SAMC): present in aged preparations at measurable concentrations. Flavonoids: Quercetin glycosides (primarily quercetin 3-O-glucoside and quercetin 4'-O-glucoside): ~47–100mg/100g dry weight; Kaempferol derivatives: present in smaller amounts. Saponins (oleanolic acid-based): ~0.06–0.1% dry weight. Fructans (inulin-type): 9–16g/100g, contributing to prebiotic activity. Silverskin cultivar specifics: Silverskin types are long-storage softneck varieties noted for relatively high alliin and fructan content compared to many hardneck types; allicin-forming potential may be marginally higher than standard softneck cultivars due to denser bulb structure. Bioavailability notes: Allicin itself is lipid-permeable but unstable and poorly measurable in plasma; its fat-soluble metabolites (DADS, DATS, ajoene) are detectable in blood and tissues. SAC is the most bioavailable organosulfur compound and serves as a key marker in standardized extracts. Cooking significantly reduces allicin yield (>60% loss upon microwave or boiling); crushing and allowing 10-minute rest before cooking preserves more allicin-derived compounds by allowing alliinase reaction to complete. Enteric-coated supplement forms improve allicin delivery to the small intestine by approximately 30–40% compared to uncoated tablets.

## Dosage & Preparation

Clinically studied doses include: raw/crushed cloves 3.6-5g/day; standardized allicin tablets 1200μg/day; aged garlic extract 400mg twice daily; garlic powder/extract 400mg twice daily to 2.56g/day. Duration ranges from 10 days to 7.5 years depending on the health goal. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Silverskin garlic is generally well-tolerated but may cause gastrointestinal upset, heartburn, and body odor in some individuals. It can enhance the effects of anticoagulant medications like warfarin, increasing bleeding risk due to allicin's antiplatelet activity. Garlic may also interact with HIV protease inhibitors and certain diabetes medications by affecting blood sugar levels. Pregnant and breastfeeding women should limit intake to culinary amounts, as therapeutic doses lack safety data in these populations.

## Scientific Research

Clinical trials on garlic varieties including Silverskin have demonstrated [antioxidant](/ingredients/condition/antioxidant), [anti-inflammatory](/ingredients/condition/inflammation), and [antimicrobial](/ingredients/condition/immune-support) effects, though specific PMIDs were not provided in the source materials. Studies range from small RCTs (n=17-50) to larger trials (n=90), with mixed results including some showing no lipid or inflammation benefits in overweight subjects (n=90, 2.1g/day for 12 weeks).

## Historical & Cultural Context

Garlic has been used for over 5000 years in traditional systems including Ayurveda, Traditional Chinese Medicine, and ancient Egyptian/Greek medicine for infections, [digestion](/ingredients/condition/gut-health), and [antimicrobial](/ingredients/condition/immune-support) support. Historical texts such as the Ebers Papyrus (~1550 BCE) document its use for wound healing and immunity, with both topical and oral applications for wounds, respiratory issues, and parasites.

## Synergistic Combinations

Piperine, Vitamin C, Selenium, N-Acetyl Cysteine, Quercetin

## Frequently Asked Questions

### What is the recommended dosage of silverskin garlic for antioxidant benefits?

Clinical studies used 3.6 grams daily of silverskin garlic extract to achieve significant increases in antioxidant enzymes. This dosage was administered for 30 days in diabetic patients and showed measurable improvements in SOD, catalase, and glutathione peroxidase levels.

### How does silverskin garlic differ from regular garlic varieties?

Silverskin garlic is a hardneck variety with white, papery outer skins and typically contains higher concentrations of allicin compared to softneck varieties. The specific cultivar 'Silverskin' may have enhanced organosulfur compound profiles, though direct comparative studies between garlic varieties are limited.

### Can silverskin garlic help with diabetes management?

Research in type 2 diabetes patients showed silverskin garlic improved antioxidant enzyme activity, which may help reduce diabetic complications related to oxidative stress. However, evidence is preliminary with only one small 20-patient study, and garlic should not replace standard diabetes medications.

### What are the main bioactive compounds in silverskin garlic?

Silverskin garlic contains alliin, which converts to allicin when the garlic is crushed or cut. Allicin then breaks down into various organosulfur compounds including diallyl disulfide, diallyl trisulfide, and ajoene, which are responsible for most therapeutic effects.

### Is silverskin garlic safe to take with blood pressure medications?

Silverskin garlic may enhance the hypotensive effects of blood pressure medications due to its vasodilatory properties from organosulfur compounds. Patients taking antihypertensive drugs should monitor blood pressure closely and consult healthcare providers before using therapeutic doses of garlic supplements.

### What does clinical research show about silverskin garlic's effect on antioxidant enzymes?

A randomized controlled trial with 20 type 2 diabetes patients demonstrated that 3.6g of silverskin garlic daily for 30 days significantly increased three key antioxidant enzymes: superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx). Another double-blind RCT with 42 menopausal women found that 1200μg allicin-equivalent daily for one year increased total antioxidant capacity while decreasing malondialdehyde, a marker of oxidative damage. Both studies provide moderate-quality evidence supporting silverskin garlic's role in enhancing the body's natural antioxidant defenses.

### Who would benefit most from silverskin garlic supplementation?

Individuals with type 2 diabetes may experience enhanced antioxidant enzyme activity, and women in or approaching menopause may benefit from improved antioxidant capacity and reduced oxidative stress markers. Those with elevated oxidative stress biomarkers or seeking to support their body's natural antioxidant defenses are also good candidates. However, supplementation decisions should be made in consultation with a healthcare provider, particularly for those on existing medications.

### How does the allicin content in silverskin garlic affect its bioavailability and effectiveness?

Silverskin garlic's bioactive benefits are largely attributed to its allicin content, which is measured in allicin-equivalents in clinical research—the study with menopausal women used 1200μg allicin-equivalent daily as the effective dose. The conversion of allicin from its precursor alliinase depends on factors such as processing method, storage conditions, and whether the garlic is fresh, fermented, or aged. Understanding allicin content helps ensure adequate dosing for achieving the antioxidant and oxidative stress-reduction benefits demonstrated in clinical trials.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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