Bone, Joint, Sports and Recovery Formulas: Glucosamine, Chondroitin and Pre-Workout

Overview

Bone, joint and sports products tend to be blends: calcium and vitamin D for bone, glucosamine and chondroitin for joints, and caffeine, creatine, amino acids and other ingredients for workouts. Each ingredient has its own evidence, and a blend cannot borrow it.

Read bone health formulas, claims checked, B-complex and calcium-plus-vitamin-D products, calcium, vitamin K and Wellness: osteoporosis and bone health.

Joint support formulas: glucosamine and chondroitin

NCCIH summarizes years of research: studies of knee osteoarthritis have had inconsistent results, expert evaluations reach conflicting conclusions, and it is still uncertain whether glucosamine and chondroitin help symptoms. [3]

Form matters: studies of a prescription-drug formulation of glucosamine looked more favorable, which could reflect real product differences or bias, since most of those studies had design weaknesses and were funded by the manufacturer. [3] Do not transfer prescription findings to supplements. Safety: glucosamine may raise blood glucose in some people, both have been associated with more bleeding in people taking warfarin, and little is known during pregnancy or breastfeeding. [3] If you take warfarin or other blood thinners, have diabetes, or are pregnant, ask a clinician or pharmacist first; see medication interactions. More detail: glucosamine and chondroitin evidence and cautions, joint health formulas and collagen for skin, joints and bone.

Pre-workout, post-workout and recovery blends

A 2018 brief review of multi-ingredient pre-workout supplements found that acute use may improve muscular endurance and mood, with mixed results for force and power. Most safety studies lasted under eight weeks, and "proprietary blends" often do not disclose specific amounts, which makes products hard to compare. [4] Label: promising but limited for short-term performance; insufficient for long-term effects.

Risks to know:

• Caffeine: the US FDA cites 400 mg a day as an amount not generally associated with negative effects for most adults, with wide variation; toxic effects such as seizures can appear with rapid intake of around 1,200 mg. [5] The FDA also notes medical experts advise against energy drinks for children and teens, and that people who are pregnant or breastfeeding should talk to a provider about caffeine. [5] Add up caffeine from the blend, coffee and energy drinks; see caffeine supplements and pre-workout side effects.
• Label accuracy: a narrative review of 16 studies found labeling differed from actual ingredient amounts in protein powders, pre-workout mixtures, creatine and other products. [6]
• Banned or hidden ingredients: the pre-workout review warned that many formulations may contain banned substances intentionally or as contaminants. [4] NCCIH says many bodybuilding products marketed as supplements have been found to contain other ingredients that can be harmful. [7] Competitive athletes should read sport certification and banned-substance contamination.
• Heart, blood pressure or anxiety conditions: caffeine-heavy products need a clinician's view first; this site cannot judge individual risk.

Single ingredients that often sit in these blends have their own pages: creatine, beta-alanine, BCAAs and protein for muscle, training and recovery. Deeper pages: post-workout and recovery formulas. Wellness: recovery after exercise. Proper evidence not found for the combined formulas as finished products beyond the review above.

What to check on the label

Look for each ingredient's amount rather than only the blend total, and do not assume amounts match a study. The FDA labeling guide says a proprietary blend lists its total weight and its ingredients in descending order by weight. [8] See how to evaluate a supplement formula.