Complementary and Alternative Therapy and Vitamins

Fundamentals of Complementary and Alternative Medicine

• Definitions

  • Complementary Health Approach: Nonmainstream practices used in conjunction with conventional medicine.

  • Alternative Health Approach: Nonmainstream practices used as a replacement for conventional medicine.

• Primary Categories and Examples

  • Products: Herbs, probiotics, and vitamins.

  • Practices: Meditation, acupuncture, and therapeutic touch.

• Usage Statistics

  • Approximately $32.3\%$ of adults in the United States have utilized some form of Complementary and Alternative Medicine (CAM).

• Dietary Supplements

  • These represent the most common form of CAM.

  • The Food and Drug Administration (FDA) defines them as products intended to supplement the diet's nutritional value.

  • Constituents include vitamins, minerals, herbs, amino acids, and other dietary substances.

• Motivations for Use

  • Perception of enhanced safety and health benefits.

  • Desire for personal control over healthcare.

  • Emotional comfort derived from taking proactive measures.

  • Cultural influences and traditions.

  • Limited access to conventional professional care.

  • Lack of health insurance coverage.

  • Convenience factors.

  • Aggressive marketing and media hype.

  • Recommendations provided by friends and family.

Regulatory Framework and Safety Standards

• Dietary Supplement Health and Education Act of 1994 (DSHEA)

  • Allows products to be marketed without prior FDA approval.

  • The FDA is only authorized to intervene if a product is proven harmful or if it makes demonstrably false claims.

  • Presumption of Safety: Unlike conventional drugs, which must be proven safe before entering the market, dietary supplements are presumed safe until proven hazardous.

  • Consumer Burden: The responsibility for proving a product's danger lies with the FDA and consumers.

• Labeling Restrictions

  • Labels must explicitly state that the product is not intended to diagnose, treat, cure, or prevent any disease.

  • Labels are permitted to make claims regarding the product's influence on body structure or function.

• Current Good Manufacturing Practices (CGMP)

  • Established by the FDA in $2007$.

  • Aimed at ensuring supplements are free from contaminants and adulterants.

  • Mandates quality-control procedures and accurate labeling.

• Dietary Supplement and Nonprescription Drug Consumer Protection Act

  • Mandates the reporting of serious adverse events associated with dietary supplements and nonprescription drugs.

  • Serious adverse events include deaths, hospitalizations, life-threatening experiences, disabilities, and birth defects.

  • Reports must be submitted within $15$ days of the event.

• Research and Quality Certification

  • National Center for Complementary and Integrative Health (NCCIH): Promotes and provides research-based information on CAM.

  • Private Certification Organizations: Four main organizations test for quality: US Pharmacopeia (USP), ConsumerLab, the Natural Products Association, and NSF International.

  • USP standards are enforceable by the FDA.

  • Criteria for the "seal of approval" include CGMP compliance, purity, identity, potency, dissolution, and labeling accuracy.

Challenges with Impurities and Standardization

• Contamination and Adulteration Risks

  • DSHEA does not adequately address impurities or variability.

  • Digitalis Lanata: Found in a contaminated bowel cleanse product, leading to heart block.

  • Ephedra: Products often show varying ephedrine content and undeclared ingredients.

  • Ginseng: Clinical analysis found a $20$-fold variation in ginsenoside content between products.

  • Heavy Metals: Asian medicines have been found to contain lead, mercury, arsenic, and undeclared pharmaceuticals.

• Standardization of Herbal Products

  • Process: Involves extracting, analyzing, and adjusting active ingredients to maintain consistency.

  • Benefits: Allows for accurate dosing and extrapolation of clinical trial data.

  • Drawbacks: The process may destroy some active compounds or fail to extract agents that have not yet been identified as active.

Key Dietary Supplements and Their Profiles

• Black Cohosh

  • Uses: Treatment of menopausal symptoms ($e.g.$, hot flashes, vaginal dryness, palpitations, depression, irritability, and sleep disturbance).

  • Actions: Mechanism is unknown; it does not interact with estrogen receptors or affect hormone levels.

  • Effectiveness: Insufficient evidence for management of menopausal symptoms according to Cochrane, NCCIH, and ACOG.

  • Adverse Effects: Rash, headache, dizziness, abdominal discomfort. Rare but serious liver inflammation and failure.

  • Interactions: Potentiates hypotensive effects of antihypertensives and hypoglycemic effects of insulin/diabetes drugs. Risk of hepatotoxicity when used with other liver-damaging drugs.

  • Caution: Do not confuse with blue cohosh, which has dangerous effects.

• Butterbur

  • Uses: Migraines, allergies, and asthma.

  • Actions: Anti-inflammatory, antispasmodic, and vasodilatory; may act as a calcium channel blocker.

  • Effectiveness: Effective for migraine prophylaxis and nasal allergy symptoms (comparable to antihistamines).

  • Adverse Effects: Belching, headache, fatigue. Risk of liver injury from pyrrolizidine alkaloids (PAs).

  • Interactions: CYP3A4-inducing drugs increase toxic metabolites of PAs, raising liver injury risk.

• Coenzyme Q-10 (CoQ-10)

  • Uses: Heart failure, statin-induced muscle injury, and mitochondrial encephalomyopathies.

  • Actions: Antioxidant involved in ATP production.

  • Effectiveness: Improves cardiac function in heart failure and semen quality/sperm count.

  • Interactions: Antagonizes warfarin due to similarity to Vitamin $K_2$. Statins reduce endogenous CoQ-10 levels by inhibiting shared synthesis pathways.

• Cranberry Juice

  • Uses: Prevention of urinary tract infections (UTIs) and reduction of urine odor.

  • Actions: Prevents bacteria from adhering to the urinary tract wall.

  • Effectiveness: Recurrent UTI prevention in specific female cohorts; not for treating established infections.

  • Adverse Effects: Excessive intake ($>1\,L/day$) may cause GI upset and kidney stones.

• Echinacea

  • Uses: Oral for immune stimulation and viral infections; topical for wounds, eczema, and psoriasis.

  • Effectiveness: Mixed; small reduction ($10\%-20\%$) in common cold risk.

  • Interactions: Opposes immunosuppressant drugs; compromises therapy for cancer, HIV, and tuberculosis.

• Feverfew

  • Uses: Migraine prophylaxis ($50-300\,mg$ twice daily), allergies, and rheumatoid arthritis.

  • Effectiveness: Probably effective for migraine prophylaxis.

  • Side Effects: Abdominal pain, GI upset, oral ulceration (from chewing leaves). Postfeverfew syndrome includes nervousness, fatigue, and joint pain.

  • Interactions: Increases bleeding risk with antiplatelet drugs ($e.g.$, aspirin) and anticoagulants ($e.g.$, warfarin, heparin).

• Flaxseed

  • Uses: Constipation, dyslipidemias, and a vegetarian source of omega-$3$ fatty acids.

  • Effectiveness: Lowers total and LDL cholesterol; acts as a bulk-forming laxative.

  • Interactions: Reduces absorption of other medications; take $1$ hour before or $2$ hours after conventional drugs.

• Garlic

  • Uses: Reducing blood pressure and atherosclerosis; suppressing platelet aggregation.

  • Effectiveness: Does not lower LDL; modest BP reduction; may decrease atherosclerosis rate.

  • Interactions: Increases bleeding risk. Reduces levels of cyclosporine and saquinavir.

• Ginger Root

  • Uses: Nausea/vomiting ($e.g.$, morning sickness, anesthesia), vertigo, and analgesic for arthritis.

  • Actions: May block $5\text{-HT}_3$ receptors; stimulates intestinal motility; inhibits prostaglandin/leukotriene synthesis.

  • Effectiveness: Effective for morning sickness (nausea reduction).

  • Interactions: Inhibits thromboxane production, increasing bleeding risk. Potentiates insulin and diabetes drugs.

• Ginkgo Biloba

  • Uses: Memory improvement, intermittent claudication, and erectile dysfunction.

  • Actions: Vasodilation and suppression of platelet-activating factor (PAF).

  • Effectiveness: Small improvement in claudication; failed to prevent dementia in GEM study.

  • Caution: Seeds are toxic (seizures/death). Increases bleeding risk.

• Glucosamine and Chondroitin

  • Uses: Osteoarthritis of the knee, hip, and wrist.

  • Actions: Glucosamine synthesizes cartilage/synovial fluid; Chondroitin maintains cartilage hydration.

  • Effectiveness: Most studies show no pain relief; not recommended by American College of Rheumatology.

  • Interactions: Potential bleeding risk with anticoagulants.

• Green Tea

  • Uses: Weight loss, mental clarity, and cancer prevention.

  • Effectiveness: Mentally clearing/weight loss benefits likely due to caffeine.

  • Interactions: Decreases warfarin effects (due to Vitamin K content) and decreases nadolol absorption.

• Peppermint (Mentha piperita)

  • Uses: IBS management, SIBO, tension headaches, and breastfeeding (nipple pain).

  • Actions: Inhibits GI smooth muscle activity; activates opioid receptors; stimulates $TRPM8$ (cold/cooling) receptors.

  • Effectiveness: Superior to placebo for IBS.

  • Adverse Effects: Lower esophageal sphincter pressure (tea); perianal burning at high doses.

• Probiotics

  • Uses: IBS, Ulcerative colitis, and C. difficile–associated diarrhea (CDAD).

  • Actions: Metabolize foods/drugs, produce lactic acid and hydrogen peroxide, increase IgA.

  • Interactions: Antibacterials/antifungals kill probiotics; space administration by $2$ hours.

• Resveratrol

  • Uses: Antiaging, antioxidant, protection against chronic disease.

  • Actions: Inhibits phosphodiesterases (PDEs), increasing cyclic AMP.

  • Adverse Effects: Antiplatelet actions; mimics estrogen; increases insulin sensitivity.

• Saw Palmetto

  • Uses: BPH urinary symptoms and androgenic alopecia.

  • Actions: Blockade of testosterone and alpha-adrenergic receptors.

  • Effectiveness: NIH/Cochrane find it no better than placebo for BPH.

• Soy

  • Components: Phytoestrogens (isoflavones) like genistein and daidzein (convert to equol).

  • Interactions: Do not combine with tamoxifen. Antibiotics reduce active form conversion. Fermented soy interacts with MAO inhibitors.

• St. John's Wort

  • Uses: Mild to moderate depression.

  • Mechanism: Decreases reuptake of serotonin, norepinephrine, and dopamine.

  • Interactions: Induces CYP450; increases P-glycoprotein synthesis (accelerates digoxin elimination). Risk of serotonin syndrome with other serotonergic agents.

• Valerian

  • Uses: Insomnia and anxiety-related restlessness.

  • Mechanism: Increases availability of GABA; may be a GABA agonist.

  • Interactions: Potentiates CNS depressants ($e.g.$, alcohol, benzodiazepines).

Harmful Supplements to Avoid

• Comfrey: Contains PAs causing venoocclusive disease (VOD) and liver damage; potentially carcinogenic.

• Kava: Severe hepatotoxicity leading to liver transplant.

• Ma Huang (Ephedra): Causes elevation in BP and heart stimulation. Associated with stroke, MI, and death. FDA banned sales of products with over $10\,mg$ per dose in $2004$.

Vitamin Classification and General Principles

• Fat-Soluble (A, D, E, K)

  • Can be stored in large amounts in the body.

  • High risk of toxicity with excessive intake.

• Water-Soluble (C and B Complex)

  • Include Thiamine ($B_1$), Riboflavin ($B_2$), Niacin ($B_3$), Pantothenic acid ($B_5$), Pyridoxine ($B_6$), Biotin ($B_7$), Folic acid ($B_9$), and Cyanocobalamin ($B_{12}$).

  • Require frequent ingestion as supplies are not stored extensively.

• Antioxidant Effects

  • Dietary antioxidants (from food) reduce oxidative stress by neutralizing free radicals.

  • High-dose supplement antioxidants ($e.g.$, $\beta$-carotene, Vitamin E) may increase risk of lung cancer, prostate cancer, and stroke.

Fat-Soluble Vitamin Profiles

• Vitamin A (Retinol)

  • Actions: Dim light adaptation, embryogenesis, spermatogenesis, and immunity.

  • Deficiency: Night blindness ($1^{st}$ indicator), xerophthalmia, and keratomalacia. Signs appear when plasma levels fall below $20\,\mu g/dL$.

  • Toxicity: Birth defects, liver injury. UL is $3000\,\mu g/day$. Hypervitaminosis A includes hepatosplenomegaly and elevated intracranial pressure.

• Vitamin D

  • Critical for calcium metabolism and bone health.

  • Deficiency results in rickets (children) and osteomalacia (adults).

• Vitamin E

  • Actions: Antioxidant; protects against lipid peroxidation and oxidation of Vitamins A and C.

  • Toxicity: Increased risk for hemorrhagic stroke (platelet inhibition). Blunts exercise-induced insulin sensitivity benefits.

  • Deficiency: Rare, usually due to fat malabsorption or $\alpha$-tocopherol transfer protein ($\alpha\text{-TTP}$) deficiency.

• Vitamin K

  • Forms: Vitamin $K_1$ (phytonadione); Vitamin $K_2$ (synthesized by gut flora); Synthetic $K_3$ and $K_4$.

  • Actions: Synthesis of prothrombin and factors VII, IX, and X. Essential for coagulation.

  • Uses: Antidote for warfarin overdose. Prophylactic injection for newborns.

  • Toxicity: IV phytonadione can cause shock or respiratory arrest.

Water-Soluble Vitamin Profiles

• Vitamin C (Ascorbic Acid)

  • Actions: Collagen production, adrenal steroid synthesis, folic acid conversion, iron absorption enhancement.

  • Deficiency: Scurvy (bleeding gums, poor wound healing, joint hemorrhage).

• Vitamin $B_1$ (Thiamine)

  • Deficiency: Beriberi. Wet beriberi involves cardiovascular complications/fluid accumulation; Dry beriberi involves neurologic deficits.

  • Alcoholism: Linked to Wernicke-Korsakoff syndrome.

• Vitamin $B_2$ (Riboflavin)

  • Deficiency Symptoms: Sore throat, angular stomatitis, glossitis, cheilosis.

• Vitamin $B_3$ (Niacin)

  • Metabolism: Converts to NAD or NADP for cellular respiration.

  • Deficiency: Pellagra (characterized by dermatitis, GI symptoms, and CNS symptoms).

• Vitamin $B_5$ (Pantothenic Acid)

  • Component of Coenzyme A and acyl carrier protein. Essential for gluconeogenesis and fatty acid synthesis.

• Vitamin $B_6$ (Pyridoxine)

  • Interactions: Isoniazid therapy can cause deficiency.

  • Toxicity: High doses cause neurologic injury ($e.g.$, ataxia).

• Vitamin $B_7$ (Biotin)

  • Cofactor for carbohydrate/fat metabolism. Used for hair loss and skin conditions.

• Vitamin $B_9$ (Folic Acid)

  • Efficiency: Synthetic folic acid has higher bioavailability ($85\%$) than natural folate ($<50\%$).

  • Use: Prevention of Neural Tube Defects (NTDs) like spina bifida and anencephaly.

• Vitamin $B_{12}$ (Cyanocobalamin)

  • Deficiency: Megaloblastic anemia (large cell anemia due to mitosis interference) and neurologic damage.